bitmapset.c File Reference

#include "postgres.h"
#include "nodes/bitmapset.h"
#include "nodes/pg_list.h"
#include "port/pg_bitutils.h"
#include "utils/hashutils.h"

Include dependency graph for bitmapset.c:

Go to the source code of this file.

Macros
#define	WORDNUM(x)   ((x) / BITS_PER_BITMAPWORD)
#define	BITNUM(x)   ((x) % BITS_PER_BITMAPWORD)
#define	BITMAPSET_SIZE(nwords)   (offsetof(Bitmapset, words) + (nwords) * sizeof(bitmapword))
#define	RIGHTMOST_ONE(x)   ((signedbitmapword) (x) & -((signedbitmapword) (x)))
#define	HAS_MULTIPLE_ONES(x)   ((bitmapword) RIGHTMOST_ONE(x) != (x))
#define	bmw_leftmost_one_pos(w)   pg_leftmost_one_pos32(w)
#define	bmw_rightmost_one_pos(w)   pg_rightmost_one_pos32(w)
#define	bmw_popcount(w)   pg_popcount32(w)

Functions
Bitmapset *	bms_copy (const Bitmapset *a)
bool	bms_equal (const Bitmapset *a, const Bitmapset *b)
int	bms_compare (const Bitmapset *a, const Bitmapset *b)
Bitmapset *	bms_make_singleton (int x)
void	bms_free (Bitmapset *a)
Bitmapset *	bms_union (const Bitmapset *a, const Bitmapset *b)
Bitmapset *	bms_intersect (const Bitmapset *a, const Bitmapset *b)
Bitmapset *	bms_difference (const Bitmapset *a, const Bitmapset *b)
bool	bms_is_subset (const Bitmapset *a, const Bitmapset *b)
BMS_Comparison	bms_subset_compare (const Bitmapset *a, const Bitmapset *b)
bool	bms_is_member (int x, const Bitmapset *a)
int	bms_member_index (Bitmapset *a, int x)
bool	bms_overlap (const Bitmapset *a, const Bitmapset *b)
bool	bms_overlap_list (const Bitmapset *a, const List *b)
bool	bms_nonempty_difference (const Bitmapset *a, const Bitmapset *b)
int	bms_singleton_member (const Bitmapset *a)
bool	bms_get_singleton_member (const Bitmapset *a, int *member)
int	bms_num_members (const Bitmapset *a)
BMS_Membership	bms_membership (const Bitmapset *a)
bool	bms_is_empty (const Bitmapset *a)
Bitmapset *	bms_add_member (Bitmapset *a, int x)
Bitmapset *	bms_del_member (Bitmapset *a, int x)
Bitmapset *	bms_add_members (Bitmapset *a, const Bitmapset *b)
Bitmapset *	bms_add_range (Bitmapset *a, int lower, int upper)
Bitmapset *	bms_int_members (Bitmapset *a, const Bitmapset *b)
Bitmapset *	bms_del_members (Bitmapset *a, const Bitmapset *b)
Bitmapset *	bms_join (Bitmapset *a, Bitmapset *b)
int	bms_first_member (Bitmapset *a)
int	bms_next_member (const Bitmapset *a, int prevbit)
int	bms_prev_member (const Bitmapset *a, int prevbit)
uint32	bms_hash_value (const Bitmapset *a)

Macro Definition Documentation

BITMAPSET_SIZE

#define BITMAPSET_SIZE

(

nwords

)

(offsetof(Bitmapset, words) + (nwords) * sizeof(bitmapword))

Definition at line 32 of file bitmapset.c.

Referenced by bms_add_member(), bms_add_range(), bms_copy(), and bms_make_singleton().

BITNUM

#define BITNUM

(

x

)

((x) % BITS_PER_BITMAPWORD)

Definition at line 30 of file bitmapset.c.

Referenced by bms_add_member(), bms_add_range(), bms_del_member(), bms_is_member(), bms_make_singleton(), bms_member_index(), bms_next_member(), bms_overlap_list(), and bms_prev_member().

bmw_leftmost_one_pos

#define bmw_leftmost_one_pos

(

w

)

pg_leftmost_one_pos32(w)

Definition at line 58 of file bitmapset.c.

Referenced by bms_prev_member().

bmw_popcount

#define bmw_popcount

(

w

)

pg_popcount32(w)

Definition at line 60 of file bitmapset.c.

Referenced by bms_member_index(), and bms_num_members().

bmw_rightmost_one_pos

#define bmw_rightmost_one_pos

(

w

)

pg_rightmost_one_pos32(w)

Definition at line 59 of file bitmapset.c.

Referenced by bms_first_member(), bms_get_singleton_member(), bms_next_member(), and bms_singleton_member().

HAS_MULTIPLE_ONES

#define HAS_MULTIPLE_ONES

(

x

)

((bitmapword) RIGHTMOST_ONE(x) != (x))

Definition at line 54 of file bitmapset.c.

Referenced by bms_get_singleton_member(), bms_membership(), and bms_singleton_member().

RIGHTMOST_ONE

#define RIGHTMOST_ONE

(

x

)

((signedbitmapword) (x) & -((signedbitmapword) (x)))

Definition at line 52 of file bitmapset.c.

Referenced by bms_first_member().

WORDNUM

#define WORDNUM

(

x

)

((x) / BITS_PER_BITMAPWORD)

Definition at line 29 of file bitmapset.c.

Referenced by bms_add_member(), bms_add_range(), bms_del_member(), bms_is_member(), bms_make_singleton(), bms_member_index(), bms_next_member(), bms_overlap_list(), and bms_prev_member().

Function Documentation

bms_add_member()

Bitmapset* bms_add_member	(	Bitmapset *	a,
		int	x
	)

Definition at line 736 of file bitmapset.c.

References BITMAPSET_SIZE, BITNUM, bms_make_singleton(), elog, ERROR, i, Bitmapset::nwords, repalloc(), WORDNUM, and Bitmapset::words.

Referenced by _readBitmapset(), add_child_rel_equivalences(), adjust_appendrel_attrs_multilevel(), adjust_child_relids(), adjust_child_relids_multilevel(), adjust_relid_set(), adjust_view_column_set(), alias_relid_set(), build_subplan(), check_functional_grouping(), check_index_only(), checkInsertTargets(), classify_index_clause_usage(), convert_EXISTS_sublink_to_join(), create_lateral_join_info(), deparseColumnRef(), dependencies_clauselist_selectivity(), DiscreteKnapsack(), do_analyze_rel(), DoCopy(), estimate_multivariate_ndistinct(), EvalPlanQualBegin(), ExecFindInitialMatchingSubPlans(), ExecInitAgg(), ExecNestLoop(), ExecRecursiveUnion(), ExecReScanGather(), ExecReScanGatherMerge(), ExecReScanRecursiveUnion(), ExecReScanSetParamPlan(), ExecScanSubPlan(), ExecSetParamPlan(), ExplainPreScanNode(), ExplainSubPlans(), extract_rollup_sets(), fetch_remote_table_info(), fetch_statentries_for_relation(), finalize_plan(), finalize_primnode(), find_childrel_parents(), find_hash_columns(), find_matching_subplans_recurse(), find_unaggregated_cols_walker(), fixup_inherited_columns(), fixup_whole_row_references(), func_get_detail(), gen_partprune_steps_internal(), generate_base_implied_equalities(), get_eclass_for_sort_expr(), get_matching_partitions(), get_primary_key_attnos(), get_relation_constraint_attnos(), get_relation_statistics(), get_relids_in_jointree(), HeapDetermineModifiedColumns(), infer_arbiter_indexes(), inheritance_planner(), intorel_startup(), load_enum_cache_data(), logicalrep_read_attrs(), make_datum_param(), make_modifytable(), make_one_rel(), make_partitionedrel_pruneinfo(), make_row_comparison_op(), make_window_input_target(), makeDependencyGraphWalker(), markRTEForSelectPriv(), offset_relid_set(), preprocess_grouping_sets(), pull_exec_paramids_walker(), pull_up_sublinks_jointree_recurse(), pull_varattnos_walker(), pull_varnos_walker(), RelationGetIndexAttrBitmap(), remove_useless_groupby_columns(), remove_useless_results_recurse(), rewriteTargetView(), RI_Initial_Check(), set_customscan_references(), set_foreignscan_references(), set_join_column_names(), set_param_references(), SS_identify_outer_params(), statext_is_compatible_clause_internal(), statext_mcv_clauselist_selectivity(), statext_ndistinct_build(), statext_ndistinct_deserialize(), transformGroupClause(), transformGroupClauseList(), transformInsertStmt(), transformRangeTableFunc(), transformUpdateTargetList(), translate_col_privs(), use_physical_tlist(), and view_cols_are_auto_updatable().

{
    int         wordnum,
                bitnum;

    if (x < 0)
        elog(ERROR, "negative bitmapset member not allowed");
    if (a == NULL)
        return bms_make_singleton(x);
    wordnum = WORDNUM(x);
    bitnum = BITNUM(x);

    /* enlarge the set if necessary */
    if (wordnum >= a->nwords)
    {
        int         oldnwords = a->nwords;
        int         i;

        a = (Bitmapset *) repalloc(a, BITMAPSET_SIZE(wordnum + 1));
        a->nwords = wordnum + 1;
        /* zero out the enlarged portion */
        for (i = oldnwords; i < a->nwords; i++)
            a->words[i] = 0;
    }

    a->words[wordnum] |= ((bitmapword) 1 << bitnum);
    return a;
}

bms_add_members()

Bitmapset* bms_add_members	(	Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 793 of file bitmapset.c.

References bms_copy(), i, Bitmapset::nwords, pfree(), and Bitmapset::words.

Referenced by add_child_join_rel_equivalences(), add_child_rel_equivalences(), add_eq_member(), add_paths_to_joinrel(), add_placeholders_to_joinrel(), add_vars_to_targetlist(), build_index_paths(), check_outerjoin_delay(), choose_bitmap_and(), create_lateral_join_info(), deconstruct_recurse(), DiscreteKnapsack(), ExecCreatePartitionPruneState(), ExecFindInitialMatchingSubPlans(), ExecFindMatchingSubPlans(), ExecInitAgg(), ExplainPreScanNode(), finalize_plan(), find_nonnullable_rels_walker(), foreign_join_ok(), get_eclass_indexes_for_relids(), heap_update(), join_is_legal(), make_outerjoininfo(), perform_pruning_combine_step(), pull_varnos_walker(), reduce_outer_joins_pass1(), reduce_outer_joins_pass2(), statext_mcv_clauselist_selectivity(), transformOnConflictArbiter(), and update_placeholder_eval_levels().

{
    Bitmapset  *result;
    const Bitmapset *other;
    int         otherlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return bms_copy(b);
    if (b == NULL)
        return a;
    /* Identify shorter and longer input; copy the longer one if needed */
    if (a->nwords < b->nwords)
    {
        result = bms_copy(b);
        other = a;
    }
    else
    {
        result = a;
        other = b;
    }
    /* And union the shorter input into the result */
    otherlen = other->nwords;
    for (i = 0; i < otherlen; i++)
        result->words[i] |= other->words[i];
    if (result != a)
        pfree(a);
    return result;
}

bms_add_range()

Bitmapset* bms_add_range	(	Bitmapset *	a,
		int	lower,
		int	upper
	)

Definition at line 834 of file bitmapset.c.

References BITMAPSET_SIZE, BITNUM, BITS_PER_BITMAPWORD, elog, ERROR, i, Bitmapset::nwords, palloc0(), repalloc(), WORDNUM, and Bitmapset::words.

Referenced by ExecInitAppend(), ExecInitMergeAppend(), get_matching_hash_bounds(), get_matching_list_bounds(), get_matching_partitions(), get_matching_range_bounds(), make_partition_pruneinfo(), perform_pruning_combine_step(), and prune_append_rel_partitions().

{
    int         lwordnum,
                lbitnum,
                uwordnum,
                ushiftbits,
                wordnum;

    /* do nothing if nothing is called for, without further checking */
    if (upper < lower)
        return a;

    if (lower < 0)
        elog(ERROR, "negative bitmapset member not allowed");
    uwordnum = WORDNUM(upper);

    if (a == NULL)
    {
        a = (Bitmapset *) palloc0(BITMAPSET_SIZE(uwordnum + 1));
        a->nwords = uwordnum + 1;
    }
    else if (uwordnum >= a->nwords)
    {
        int         oldnwords = a->nwords;
        int         i;

        /* ensure we have enough words to store the upper bit */
        a = (Bitmapset *) repalloc(a, BITMAPSET_SIZE(uwordnum + 1));
        a->nwords = uwordnum + 1;
        /* zero out the enlarged portion */
        for (i = oldnwords; i < a->nwords; i++)
            a->words[i] = 0;
    }

    wordnum = lwordnum = WORDNUM(lower);

    lbitnum = BITNUM(lower);
    ushiftbits = BITS_PER_BITMAPWORD - (BITNUM(upper) + 1);

    /*
     * Special case when lwordnum is the same as uwordnum we must perform the
     * upper and lower masking on the word.
     */
    if (lwordnum == uwordnum)
    {
        a->words[lwordnum] |= ~(bitmapword) (((bitmapword) 1 << lbitnum) - 1)
            & (~(bitmapword) 0) >> ushiftbits;
    }
    else
    {
        /* turn on lbitnum and all bits left of it */
        a->words[wordnum++] |= ~(bitmapword) (((bitmapword) 1 << lbitnum) - 1);

        /* turn on all bits for any intermediate words */
        while (wordnum < uwordnum)
            a->words[wordnum++] = ~(bitmapword) 0;

        /* turn on upper's bit and all bits right of it. */
        a->words[uwordnum] |= (~(bitmapword) 0) >> ushiftbits;
    }

    return a;
}

bms_compare()

int bms_compare	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 147 of file bitmapset.c.

References bms_is_empty(), i, Min, Bitmapset::nwords, and Bitmapset::words.

Referenced by append_startup_cost_compare(), and append_total_cost_compare().

{
    int         shortlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return bms_is_empty(b) ? 0 : -1;
    else if (b == NULL)
        return bms_is_empty(a) ? 0 : +1;
    /* Handle cases where one input is longer than the other */
    shortlen = Min(a->nwords, b->nwords);
    for (i = shortlen; i < a->nwords; i++)
    {
        if (a->words[i] != 0)
            return +1;
    }
    for (i = shortlen; i < b->nwords; i++)
    {
        if (b->words[i] != 0)
            return -1;
    }
    /* Process words in common */
    i = shortlen;
    while (--i >= 0)
    {
        bitmapword  aw = a->words[i];
        bitmapword  bw = b->words[i];

        if (aw != bw)
            return (aw > bw) ? +1 : -1;
    }
    return 0;
}

bms_copy()

Bitmapset* bms_copy

(

const Bitmapset *

a

)

Definition at line 74 of file bitmapset.c.

References BITMAPSET_SIZE, Bitmapset::nwords, and palloc().

Referenced by adjust_child_relids(), adjust_relid_set(), bms_add_members(), bms_difference(), bms_intersect(), bms_union(), build_child_join_rel(), build_index_paths(), build_join_rel(), build_simple_rel(), calc_nestloop_required_outer(), check_equivalence_delay(), check_outerjoin_delay(), choose_bitmap_and(), create_lateral_join_info(), DiscreteKnapsack(), distribute_qual_to_rels(), ExecCreatePartitionPruneState(), ExecFindInitialMatchingSubPlans(), ExecFindMatchingSubPlans(), fetch_upper_rel(), finalize_plan(), finalize_primnode(), find_hash_columns(), find_placeholder_info(), fixup_whole_row_references(), generate_base_implied_equalities_const(), generate_base_implied_equalities_no_const(), get_bitmap_tree_required_outer(), get_relation_statistics(), innerrel_is_unique(), join_is_legal(), load_enum_cache_data(), logicalrep_relmap_update(), make_outerjoininfo(), perform_pruning_combine_step(), reconsider_full_join_clause(), reconsider_outer_join_clause(), RelationGetIndexAttrBitmap(), remove_rel_from_query(), and reparameterize_path_by_child().

{
    Bitmapset  *result;
    size_t      size;

    if (a == NULL)
        return NULL;
    size = BITMAPSET_SIZE(a->nwords);
    result = (Bitmapset *) palloc(size);
    memcpy(result, a, size);
    return result;
}

bms_del_member()

Bitmapset* bms_del_member	(	Bitmapset *	a,
		int	x
	)

Definition at line 773 of file bitmapset.c.

References BITNUM, elog, ERROR, WORDNUM, and Bitmapset::words.

Referenced by adjust_child_relids(), adjust_relid_set(), build_index_paths(), BuildParameterizedTidPaths(), dependencies_clauselist_selectivity(), DiscreteKnapsack(), finalize_plan(), finalize_primnode(), find_hash_columns(), fixup_whole_row_references(), get_matching_list_bounds(), postgresGetForeignPaths(), preprocess_rowmarks(), remove_rel_from_query(), substitute_phv_relids_walker(), and TopologicalSort().

{
    int         wordnum,
                bitnum;

    if (x < 0)
        elog(ERROR, "negative bitmapset member not allowed");
    if (a == NULL)
        return NULL;
    wordnum = WORDNUM(x);
    bitnum = BITNUM(x);
    if (wordnum < a->nwords)
        a->words[wordnum] &= ~((bitmapword) 1 << bitnum);
    return a;
}

bms_del_members()

Bitmapset* bms_del_members	(	Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 928 of file bitmapset.c.

References i, Min, Bitmapset::nwords, and Bitmapset::words.

Referenced by build_join_rel(), calc_nestloop_required_outer(), check_index_only(), DiscreteKnapsack(), finalize_plan(), make_partition_pruneinfo(), and min_join_parameterization().

{
    int         shortlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return NULL;
    if (b == NULL)
        return a;
    /* Remove b's bits from a; we need never copy */
    shortlen = Min(a->nwords, b->nwords);
    for (i = 0; i < shortlen; i++)
        a->words[i] &= ~b->words[i];
    return a;
}

bms_difference()

Bitmapset* bms_difference	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 291 of file bitmapset.c.

References bms_copy(), i, Min, Bitmapset::nwords, and Bitmapset::words.

Referenced by add_child_join_rel_equivalences(), add_child_rel_equivalences(), add_paths_to_joinrel(), check_index_predicates(), consider_new_or_clause(), finalize_plan(), find_placeholder_info(), and remove_useless_groupby_columns().

{
    Bitmapset  *result;
    int         shortlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return NULL;
    if (b == NULL)
        return bms_copy(a);
    /* Copy the left input */
    result = bms_copy(a);
    /* And remove b's bits from result */
    shortlen = Min(a->nwords, b->nwords);
    for (i = 0; i < shortlen; i++)
        result->words[i] &= ~b->words[i];
    return result;
}

bms_equal()

bool bms_equal	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 94 of file bitmapset.c.

References bms_is_empty(), i, Bitmapset::nwords, and Bitmapset::words.

Referenced by add_path_precheck(), add_paths_to_append_rel(), adjust_appendrel_attrs_multilevel(), adjust_child_relids_multilevel(), bitmap_match(), bms_equal_any(), choose_bitmap_and(), create_append_path(), create_merge_append_path(), create_unique_path(), extract_rollup_sets(), fetch_upper_rel(), find_dependent_phvs_walker(), find_join_rel(), find_param_path_info(), generate_implied_equalities_for_column(), get_cheapest_parameterized_child_path(), get_eclass_for_sort_expr(), has_join_restriction(), infer_arbiter_indexes(), is_safe_restriction_clause_for(), join_is_legal(), make_one_rel(), make_partitionedrel_pruneinfo(), match_pathkeys_to_index(), populate_joinrel_with_paths(), and try_partitionwise_join().

{
    const Bitmapset *shorter;
    const Bitmapset *longer;
    int         shortlen;
    int         longlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
    {
        if (b == NULL)
            return true;
        return bms_is_empty(b);
    }
    else if (b == NULL)
        return bms_is_empty(a);
    /* Identify shorter and longer input */
    if (a->nwords <= b->nwords)
    {
        shorter = a;
        longer = b;
    }
    else
    {
        shorter = b;
        longer = a;
    }
    /* And process */
    shortlen = shorter->nwords;
    for (i = 0; i < shortlen; i++)
    {
        if (shorter->words[i] != longer->words[i])
            return false;
    }
    longlen = longer->nwords;
    for (; i < longlen; i++)
    {
        if (longer->words[i] != 0)
            return false;
    }
    return true;
}

bms_first_member()

int bms_first_member

(

Bitmapset *

a

)

Definition at line 996 of file bitmapset.c.

References BITS_PER_BITMAPWORD, bmw_rightmost_one_pos, Bitmapset::nwords, RIGHTMOST_ONE, and Bitmapset::words.

Referenced by check_relation_privileges(), check_selective_binary_conversion(), convert_EXISTS_sublink_to_join(), find_hash_columns(), HeapDetermineModifiedColumns(), and make_row_comparison_op().

{
    int         nwords;
    int         wordnum;

    if (a == NULL)
        return -1;
    nwords = a->nwords;
    for (wordnum = 0; wordnum < nwords; wordnum++)
    {
        bitmapword  w = a->words[wordnum];

        if (w != 0)
        {
            int         result;

            w = RIGHTMOST_ONE(w);
            a->words[wordnum] &= ~w;

            result = wordnum * BITS_PER_BITMAPWORD;
            result += bmw_rightmost_one_pos(w);
            return result;
        }
    }
    return -1;
}

bms_free()

void bms_free

(

Bitmapset *

a

)

Definition at line 208 of file bitmapset.c.

References pfree().

Referenced by adjust_child_relids_multilevel(), calc_nestloop_required_outer(), check_index_only(), check_outerjoin_delay(), choose_best_statistics(), convert_EXISTS_sublink_to_join(), create_foreignscan_plan(), create_nestloop_plan(), deparseColumnRef(), examine_variable(), ExecEndNode(), ExecFindInitialMatchingSubPlans(), ExecReScan(), ExecReScanAppend(), ExecReScanMergeAppend(), extract_rollup_sets(), ExtractReplicaIdentity(), finalize_plan(), find_hash_columns(), func_get_detail(), get_relation_statistics(), has_legal_joinclause(), heap_update(), load_enum_cache_data(), logicalrep_relmap_free_entry(), logicalrep_write_attrs(), make_join_rel(), NumRelids(), reduce_outer_joins_pass2(), RelationDestroyRelation(), RelationGetIndexAttrBitmap(), reparameterize_path_by_child(), try_hashjoin_path(), try_mergejoin_path(), try_nestloop_path(), and UpdateChangedParamSet().

{
    if (a)
        pfree(a);
}

bms_get_singleton_member()

bool bms_get_singleton_member	(	const Bitmapset *	a,
		int *	member
	)

Definition at line 615 of file bitmapset.c.

References BITS_PER_BITMAPWORD, bmw_rightmost_one_pos, HAS_MULTIPLE_ONES, Bitmapset::nwords, and Bitmapset::words.

Referenced by add_placeholders_to_base_rels(), create_lateral_join_info(), find_single_rel_for_clauses(), generate_base_implied_equalities_no_const(), get_common_eclass_indexes(), join_is_removable(), reduce_unique_semijoins(), and set_base_rel_consider_startup().

{
    int         result = -1;
    int         nwords;
    int         wordnum;

    if (a == NULL)
        return false;
    nwords = a->nwords;
    for (wordnum = 0; wordnum < nwords; wordnum++)
    {
        bitmapword  w = a->words[wordnum];

        if (w != 0)
        {
            if (result >= 0 || HAS_MULTIPLE_ONES(w))
                return false;
            result = wordnum * BITS_PER_BITMAPWORD;
            result += bmw_rightmost_one_pos(w);
        }
    }
    if (result < 0)
        return false;
    *member = result;
    return true;
}

bms_hash_value()

uint32 bms_hash_value

(

const Bitmapset *

a

)

Definition at line 1154 of file bitmapset.c.

References DatumGetUInt32, hash_any(), Bitmapset::nwords, and Bitmapset::words.

Referenced by bitmap_hash().

{
    int         lastword;

    if (a == NULL)
        return 0;               /* All empty sets hash to 0 */
    for (lastword = a->nwords; --lastword >= 0;)
    {
        if (a->words[lastword] != 0)
            break;
    }
    if (lastword < 0)
        return 0;               /* All empty sets hash to 0 */
    return DatumGetUInt32(hash_any((const unsigned char *) a->words,
                                   (lastword + 1) * sizeof(bitmapword)));
}

bms_int_members()

Bitmapset* bms_int_members	(	Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 902 of file bitmapset.c.

References i, Min, Bitmapset::nwords, pfree(), and Bitmapset::words.

Referenced by check_outerjoin_delay(), find_nonnullable_rels_walker(), find_placeholder_info(), get_common_eclass_indexes(), make_outerjoininfo(), make_row_comparison_op(), perform_pruning_combine_step(), pull_varnos_walker(), and relation_is_updatable().

{
    int         shortlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return NULL;
    if (b == NULL)
    {
        pfree(a);
        return NULL;
    }
    /* Intersect b into a; we need never copy */
    shortlen = Min(a->nwords, b->nwords);
    for (i = 0; i < shortlen; i++)
        a->words[i] &= b->words[i];
    for (; i < a->nwords; i++)
        a->words[i] = 0;
    return a;
}

bms_intersect()

Bitmapset* bms_intersect	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 259 of file bitmapset.c.

References bms_copy(), i, Bitmapset::nwords, and Bitmapset::words.

Referenced by choose_best_statistics(), estimate_multivariate_ndistinct(), get_eclass_for_sort_expr(), make_outerjoininfo(), match_eclasses_to_foreign_key_col(), process_equivalence(), reconsider_full_join_clause(), reconsider_outer_join_clause(), set_param_references(), and UpdateChangedParamSet().

{
    Bitmapset  *result;
    const Bitmapset *other;
    int         resultlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL || b == NULL)
        return NULL;
    /* Identify shorter and longer input; copy the shorter one */
    if (a->nwords <= b->nwords)
    {
        result = bms_copy(a);
        other = b;
    }
    else
    {
        result = bms_copy(b);
        other = a;
    }
    /* And intersect the longer input with the result */
    resultlen = result->nwords;
    for (i = 0; i < resultlen; i++)
        result->words[i] &= other->words[i];
    return result;
}

bms_is_empty()

bool bms_is_empty

(

const Bitmapset *

a

)

Definition at line 701 of file bitmapset.c.

References Bitmapset::nwords, and Bitmapset::words.

Referenced by add_eq_member(), add_vars_to_targetlist(), bms_compare(), bms_equal(), bms_is_subset(), bms_nonempty_difference(), bms_subset_compare(), build_index_paths(), build_join_rel(), calc_nestloop_required_outer(), check_index_predicates(), compute_semijoin_info(), consider_groupingsets_paths(), convert_ANY_sublink_to_join(), convert_EXISTS_sublink_to_join(), create_foreign_join_path(), create_foreign_upper_path(), create_lateral_join_info(), distribute_qual_to_rels(), eclass_useful_for_merging(), ExecCheckRTEPerms(), ExecCheckRTEPermsModified(), ExecFindInitialMatchingSubPlans(), ExecInitAppend(), ExecInitMergeAppend(), ExecInitParallelPlan(), ExecParallelReinitialize(), ExecReScanSetParamPlan(), ExtractReplicaIdentity(), finalize_plan(), find_em_expr_for_rel(), find_nonnullable_rels_walker(), find_placeholder_info(), find_single_rel_for_clauses(), gen_partprune_steps_internal(), generate_join_implied_equalities(), generate_join_implied_equalities_for_ecs(), get_appendrel_parampathinfo(), get_baserel_parampathinfo(), get_cheapest_parallel_safe_total_inner(), get_joinrel_parampathinfo(), get_matching_list_bounds(), get_matching_range_bounds(), get_useful_ecs_for_relation(), GetParentedForeignKeyRefs(), hash_inner_and_outer(), is_pseudo_constant_clause_relids(), make_outerjoininfo(), make_partitionedrel_pruneinfo(), make_restrictinfo_internal(), match_clause_to_partition_key(), match_unsorted_outer(), min_join_parameterization(), postgresGetForeignJoinPaths(), postgresGetForeignPaths(), preprocess_grouping_sets(), process_equivalence(), pull_varnos_walker(), recurse_set_operations(), relation_has_unique_index_for(), relation_is_updatable(), remove_rel_from_query(), remove_result_refs(), rewriteTargetView(), sepgsql_dml_privileges(), set_subquery_pathlist(), sort_inner_and_outer(), substitute_phv_relids_walker(), TopologicalSort(), try_partial_hashjoin_path(), try_partial_mergejoin_path(), try_partial_nestloop_path(), UpdateChangedParamSet(), and use_physical_tlist().

{
    int         nwords;
    int         wordnum;

    if (a == NULL)
        return true;
    nwords = a->nwords;
    for (wordnum = 0; wordnum < nwords; wordnum++)
    {
        bitmapword  w = a->words[wordnum];

        if (w != 0)
            return false;
    }
    return true;
}

bms_is_member()

bool bms_is_member	(	int	x,
		const Bitmapset *	a
	)

Definition at line 427 of file bitmapset.c.

References BITNUM, elog, ERROR, Bitmapset::nwords, WORDNUM, and Bitmapset::words.

Referenced by adjust_child_relids(), adjust_relid_set(), adjust_rowcount_for_semijoins(), bms_is_subset_singleton(), bms_member_index(), check_redundant_nullability_qual(), check_relation_privileges(), checkInsertTargets(), clauselist_selectivity_simple(), ComputePartitionAttrs(), consider_groupingsets_paths(), create_foreignscan_plan(), create_lateral_join_info(), DefineIndex(), deparseFromExprForRel(), deparseLockingClause(), deparseRangeTblRef(), deparseTargetList(), deparseVar(), dependencies_clauselist_selectivity(), dependency_is_fully_matched(), do_analyze_rel(), enum_known_sorted(), estimate_multivariate_ndistinct(), examine_variable(), exec_check_rw_parameter(), ExecBuildSlotValueDescription(), ExecEvalGroupingFunc(), ExecInitModifyTable(), expand_indexqual_rowcompare(), ExplainSubPlans(), ExtractReplicaIdentity(), find_hash_columns(), fixup_whole_row_references(), foreign_expr_walker(), func_get_detail(), gen_partprune_steps_internal(), gen_prune_steps_from_opexps(), get_foreign_key_join_selectivity(), get_matching_hash_bounds(), get_tablefunc(), has_partition_attrs(), identify_current_nestloop_params(), inheritance_planner(), InitPlan(), is_foreign_param(), is_pseudo_constant_for_index(), is_subquery_var(), IsTidEqualAnyClause(), IsTidEqualClause(), join_clause_is_movable_to(), join_is_removable(), logicalrep_rel_open(), logicalrep_write_attrs(), make_outerjoininfo(), make_window_input_target(), mark_invalid_subplans_as_finished(), match_opclause_to_indexcol(), match_rowcompare_to_indexcol(), match_saopclause_to_indexcol(), perform_pruning_base_step(), plpgsql_param_fetch(), prepare_projection_slot(), preprocess_rowmarks(), process_subquery_nestloop_params(), pullup_replace_vars_callback(), remove_rel_from_query(), remove_unused_subquery_outputs(), remove_useless_groupby_columns(), replace_nestloop_params_mutator(), set_join_column_names(), set_rtable_names(), statext_is_compatible_clause(), statext_mcv_clauselist_selectivity(), substitute_phv_relids_walker(), tfuncLoadRows(), transformGroupClauseExpr(), translate_col_privs(), TriggerEnabled(), use_physical_tlist(), and view_cols_are_auto_updatable().

{
    int         wordnum,
                bitnum;

    /* XXX better to just return false for x<0 ? */
    if (x < 0)
        elog(ERROR, "negative bitmapset member not allowed");
    if (a == NULL)
        return false;
    wordnum = WORDNUM(x);
    bitnum = BITNUM(x);
    if (wordnum >= a->nwords)
        return false;
    if ((a->words[wordnum] & ((bitmapword) 1 << bitnum)) != 0)
        return true;
    return false;
}

bms_is_subset()

bool bms_is_subset	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 315 of file bitmapset.c.

References bms_is_empty(), i, Min, Bitmapset::nwords, and Bitmapset::words.

Referenced by add_child_rel_equivalences(), add_paths_to_joinrel(), add_placeholders_to_joinrel(), add_vars_to_targetlist(), check_functional_grouping(), check_index_only(), check_outerjoin_delay(), clause_sides_match_join(), compute_semijoin_info(), convert_ANY_sublink_to_join(), convert_EXISTS_sublink_to_join(), create_index_paths(), deconstruct_recurse(), distribute_qual_to_rels(), eclass_already_used(), eclass_useful_for_merging(), extract_rollup_sets(), final_cost_hashjoin(), finalize_plan(), find_ec_member_for_tle(), find_em_expr_for_rel(), foreign_join_ok(), generate_implied_equalities_for_column(), generate_join_implied_equalities_broken(), generate_join_implied_equalities_normal(), get_appendrel_parampathinfo(), get_baserel_parampathinfo(), get_cheapest_fractional_path_for_pathkeys(), get_cheapest_parameterized_child_path(), get_cheapest_path_for_pathkeys(), get_join_index_paths(), get_join_variables(), get_joinrel_parampathinfo(), get_switched_clauses(), has_join_restriction(), has_relevant_eclass_joinclause(), have_dangerous_phv(), have_join_order_restriction(), have_partkey_equi_join(), identify_current_nestloop_params(), initial_cost_mergejoin(), innerrel_is_unique(), is_simple_subquery(), join_clause_is_movable_into(), join_is_legal(), join_is_removable(), jointree_contains_lateral_outer_refs(), make_outerjoininfo(), populate_joinrel_with_paths(), prepare_sort_from_pathkeys(), process_subquery_nestloop_params(), remove_rel_from_query(), reparameterize_path(), replace_nestloop_params_mutator(), statext_mcv_clauselist_selectivity(), subbuild_joinrel_joinlist(), subbuild_joinrel_restrictlist(), try_partial_nestloop_path(), update_placeholder_eval_levels(), and use_physical_tlist().

{
    int         shortlen;
    int         longlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return true;            /* empty set is a subset of anything */
    if (b == NULL)
        return bms_is_empty(a);
    /* Check common words */
    shortlen = Min(a->nwords, b->nwords);
    for (i = 0; i < shortlen; i++)
    {
        if ((a->words[i] & ~b->words[i]) != 0)
            return false;
    }
    /* Check extra words */
    if (a->nwords > b->nwords)
    {
        longlen = a->nwords;
        for (; i < longlen; i++)
        {
            if (a->words[i] != 0)
                return false;
        }
    }
    return true;
}

bms_join()

Bitmapset* bms_join	(	Bitmapset *	a,
		Bitmapset *	b
	)

Definition at line 949 of file bitmapset.c.

References i, Bitmapset::nwords, pfree(), and Bitmapset::words.

Referenced by add_paths_to_joinrel(), alias_relid_set(), finalize_primnode(), find_nonnullable_rels_walker(), get_bitmap_tree_required_outer(), get_partkey_exec_paramids(), get_relids_in_jointree(), make_partition_pruneinfo(), process_equivalence(), pull_up_sublinks_jointree_recurse(), pull_varnos_walker(), and UpdateChangedParamSet().

{
    Bitmapset  *result;
    Bitmapset  *other;
    int         otherlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return b;
    if (b == NULL)
        return a;
    /* Identify shorter and longer input; use longer one as result */
    if (a->nwords < b->nwords)
    {
        result = b;
        other = a;
    }
    else
    {
        result = a;
        other = b;
    }
    /* And union the shorter input into the result */
    otherlen = other->nwords;
    for (i = 0; i < otherlen; i++)
        result->words[i] |= other->words[i];
    if (other != result)        /* pure paranoia */
        pfree(other);
    return result;
}

bms_make_singleton()

Bitmapset* bms_make_singleton

(

int

x

)

Definition at line 186 of file bitmapset.c.

References BITMAPSET_SIZE, BITNUM, elog, ERROR, Bitmapset::nwords, palloc0(), WORDNUM, and Bitmapset::words.

Referenced by ATExecDropColumn(), ATPrepAlterColumnType(), bms_add_member(), build_base_rel_tlists(), build_simple_rel(), deconstruct_recurse(), deparseReturningList(), DiscreteKnapsack(), ExecInitAppend(), ExecInitMergeAppend(), expand_inherited_rtentry(), extract_lateral_references(), find_dependent_phvs(), find_nonnullable_rels_walker(), get_matching_hash_bounds(), get_matching_list_bounds(), get_matching_range_bounds(), get_relids_in_jointree(), inheritance_planner(), load_enum_cache_data(), pg_column_is_updatable(), pull_up_sublinks_jointree_recurse(), pullup_replace_vars_callback(), and reduce_outer_joins_pass1().

{
    Bitmapset  *result;
    int         wordnum,
                bitnum;

    if (x < 0)
        elog(ERROR, "negative bitmapset member not allowed");
    wordnum = WORDNUM(x);
    bitnum = BITNUM(x);
    result = (Bitmapset *) palloc0(BITMAPSET_SIZE(wordnum + 1));
    result->nwords = wordnum + 1;
    result->words[wordnum] = ((bitmapword) 1 << bitnum);
    return result;
}

bms_member_index()

int bms_member_index	(	Bitmapset *	a,
		int	x
	)

Definition at line 453 of file bitmapset.c.

References BITNUM, bms_is_member(), bmw_popcount, i, WORDNUM, and Bitmapset::words.

Referenced by mcv_get_match_bitmap().

{
    int         i;
    int         bitnum;
    int         wordnum;
    int         result = 0;
    bitmapword  mask;

    /* return -1 if not a member of the bitmap */
    if (!bms_is_member(x, a))
        return -1;

    wordnum = WORDNUM(x);
    bitnum = BITNUM(x);

    /* count bits in preceding words */
    for (i = 0; i < wordnum; i++)
    {
        bitmapword  w = a->words[i];

        /* No need to count the bits in a zero word */
        if (w != 0)
            result += bmw_popcount(w);
    }

    /*
     * Now add bits of the last word, but only those before the item. We can
     * do that by applying a mask and then using popcount again. To get
     * 0-based index, we want to count only preceding bits, not the item
     * itself, so we subtract 1.
     */
    mask = ((bitmapword) 1 << bitnum) - 1;
    result += bmw_popcount(a->words[wordnum] & mask);

    return result;
}

bms_membership()

BMS_Membership bms_membership

(

const Bitmapset *

a

)

Definition at line 672 of file bitmapset.c.

References BMS_EMPTY_SET, BMS_MULTIPLE, BMS_SINGLETON, HAS_MULTIPLE_ONES, Bitmapset::nwords, and Bitmapset::words.

Referenced by add_child_join_rel_equivalences(), bms_is_subset_singleton(), clauselist_selectivity_simple(), deparseFromExpr(), deparseLockingClause(), deparseVar(), dependency_is_compatible_clause(), distribute_qual_to_rels(), distribute_restrictinfo_to_rels(), examine_variable(), find_join_input_rel(), find_nonnullable_rels_walker(), generate_base_implied_equalities(), generate_base_implied_equalities_broken(), generate_base_implied_equalities_const(), get_foreign_key_join_selectivity(), remove_useless_groupby_columns(), set_rel_pathlist(), set_tablesample_rel_pathlist(), statext_is_compatible_clause(), statext_mcv_clauselist_selectivity(), and treat_as_join_clause().

{
    BMS_Membership result = BMS_EMPTY_SET;
    int         nwords;
    int         wordnum;

    if (a == NULL)
        return BMS_EMPTY_SET;
    nwords = a->nwords;
    for (wordnum = 0; wordnum < nwords; wordnum++)
    {
        bitmapword  w = a->words[wordnum];

        if (w != 0)
        {
            if (result != BMS_EMPTY_SET || HAS_MULTIPLE_ONES(w))
                return BMS_MULTIPLE;
            result = BMS_SINGLETON;
        }
    }
    return result;
}

bms_next_member()

int bms_next_member	(	const Bitmapset *	a,
		int	prevbit
	)

Definition at line 1043 of file bitmapset.c.

References BITNUM, BITS_PER_BITMAPWORD, bmw_rightmost_one_pos, Bitmapset::nwords, WORDNUM, and Bitmapset::words.

Referenced by add_child_join_rel_equivalences(), add_child_rel_equivalences(), add_join_clause_to_rels(), add_paths_to_append_rel(), adjust_view_column_set(), alias_relid_set(), approximate_joinrel_size(), build_attnums_array(), choose_next_subplan_for_worker(), choose_next_subplan_locally(), ComputePartitionAttrs(), create_lateral_join_info(), deparseLockingClause(), EstimateParamExecSpace(), ExecCheckRTEPerms(), ExecCheckRTEPermsModified(), ExecFindInitialMatchingSubPlans(), ExecInitAgg(), ExecInitAppend(), ExecInitMergeAppend(), ExecMergeAppend(), ExecScanReScan(), ExecSetParamPlanMulti(), expand_partitioned_rtentry(), find_appinfos_by_relids(), find_matching_subplans_recurse(), fixup_inherited_columns(), format_expr_params(), generate_base_implied_equalities(), generate_implied_equalities_for_column(), generate_join_implied_equalities(), generate_partitionwise_join_paths(), get_eclass_for_sort_expr(), get_eclass_indexes_for_relids(), get_loop_count(), get_matching_partitions(), has_relevant_eclass_joinclause(), have_relevant_eclass_joinclause(), inheritance_planner(), logicalrep_rel_open(), lookup_var_attr_stats(), match_eclasses_to_foreign_key_col(), offset_relid_set(), outBitmapset(), pg_ndistinct_out(), postgresBeginForeignScan(), postgresPlanDirectModify(), postgresPlanForeignModify(), remove_join_clause_from_rels(), remove_useless_results_recurse(), SerializeParamExecParams(), set_customscan_references(), set_foreignscan_references(), show_eval_params(), statext_is_compatible_clause(), and statext_ndistinct_serialize().

{
    int         nwords;
    int         wordnum;
    bitmapword  mask;

    if (a == NULL)
        return -2;
    nwords = a->nwords;
    prevbit++;
    mask = (~(bitmapword) 0) << BITNUM(prevbit);
    for (wordnum = WORDNUM(prevbit); wordnum < nwords; wordnum++)
    {
        bitmapword  w = a->words[wordnum];

        /* ignore bits before prevbit */
        w &= mask;

        if (w != 0)
        {
            int         result;

            result = wordnum * BITS_PER_BITMAPWORD;
            result += bmw_rightmost_one_pos(w);
            return result;
        }

        /* in subsequent words, consider all bits */
        mask = (~(bitmapword) 0);
    }
    return -2;
}

bms_nonempty_difference()

bool bms_nonempty_difference	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 545 of file bitmapset.c.

References bms_is_empty(), i, Min, Bitmapset::nwords, and Bitmapset::words.

Referenced by add_placeholders_to_base_rels(), add_placeholders_to_joinrel(), allow_star_schema_join(), build_joinrel_tlist(), foreign_join_ok(), and use_physical_tlist().

{
    int         shortlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return false;
    if (b == NULL)
        return !bms_is_empty(a);
    /* Check words in common */
    shortlen = Min(a->nwords, b->nwords);
    for (i = 0; i < shortlen; i++)
    {
        if ((a->words[i] & ~b->words[i]) != 0)
            return true;
    }
    /* Check extra words in a */
    for (; i < a->nwords; i++)
    {
        if (a->words[i] != 0)
            return true;
    }
    return false;
}

bms_num_members()

int bms_num_members

(

const Bitmapset *

a

)

Definition at line 646 of file bitmapset.c.

References bmw_popcount, Bitmapset::nwords, and Bitmapset::words.

Referenced by adjust_appendrel_attrs_multilevel(), build_attnums_array(), build_join_rel(), BuildRelationExtStatistics(), choose_best_statistics(), clauselist_selectivity_simple(), ComputeExtStatisticsRows(), dependencies_clauselist_selectivity(), estimate_multivariate_ndistinct(), ExecFindInitialMatchingSubPlans(), ExecInitAppend(), ExecInitMergeAppend(), expand_partitioned_rtentry(), find_appinfos_by_relids(), find_hash_columns(), find_strongest_dependency(), gen_partprune_steps_internal(), get_matching_hash_bounds(), lookup_var_attr_stats(), make_partition_pruneinfo(), mark_invalid_subplans_as_finished(), NumRelids(), SerializeParamExecParams(), statext_ndistinct_build(), and statext_ndistinct_serialize().

{
    int         result = 0;
    int         nwords;
    int         wordnum;

    if (a == NULL)
        return 0;
    nwords = a->nwords;
    for (wordnum = 0; wordnum < nwords; wordnum++)
    {
        bitmapword  w = a->words[wordnum];

        /* No need to count the bits in a zero word */
        if (w != 0)
            result += bmw_popcount(w);
    }
    return result;
}

bms_overlap()

bool bms_overlap	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 494 of file bitmapset.c.

References i, Min, Bitmapset::nwords, and Bitmapset::words.

Referenced by add_child_join_rel_equivalences(), add_child_rel_equivalences(), add_paths_to_joinrel(), adjust_child_relids_multilevel(), allow_star_schema_join(), calc_nestloop_required_outer(), calc_non_nestloop_required_outer(), check_outerjoin_delay(), choose_bitmap_and(), compute_semijoin_info(), create_nestloop_path(), distribute_qual_to_rels(), eclass_useful_for_merging(), ExecReScanAgg(), ExecReScanAppend(), ExecReScanFunctionScan(), ExecReScanMergeAppend(), ExecUpdateLockMode(), generate_implied_equalities_for_column(), generate_join_implied_equalities(), generate_join_implied_equalities_for_ecs(), get_appendrel_parampathinfo(), get_baserel_parampathinfo(), get_joinrel_parampathinfo(), get_useful_ecs_for_relation(), has_join_restriction(), has_legal_joinclause(), has_partition_attrs(), have_dangerous_phv(), have_join_order_restriction(), have_relevant_eclass_joinclause(), have_relevant_joinclause(), heap_update(), identify_current_nestloop_params(), join_clause_is_movable_into(), join_clause_is_movable_to(), join_is_legal(), join_is_removable(), join_search_one_level(), make_join_rel(), make_outerjoininfo(), make_rels_by_clause_joins(), make_rels_by_clauseless_joins(), make_restrictinfo_internal(), pullup_replace_vars_callback(), reduce_outer_joins_pass2(), reparameterize_path_by_child(), replace_nestloop_params_mutator(), select_outer_pathkeys_for_merge(), transformUpdateTargetList(), try_hashjoin_path(), try_mergejoin_path(), try_nestloop_path(), try_partitionwise_join(), and update_placeholder_eval_levels().

{
    int         shortlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL || b == NULL)
        return false;
    /* Check words in common */
    shortlen = Min(a->nwords, b->nwords);
    for (i = 0; i < shortlen; i++)
    {
        if ((a->words[i] & b->words[i]) != 0)
            return true;
    }
    return false;
}

bms_overlap_list()

bool bms_overlap_list	(	const Bitmapset *	a,
		const List *	b
	)

Definition at line 516 of file bitmapset.c.

References BITNUM, elog, ERROR, lfirst_int, NIL, WORDNUM, and Bitmapset::words.

Referenced by preprocess_grouping_sets().

{
    ListCell   *lc;
    int         wordnum,
                bitnum;

    if (a == NULL || b == NIL)
        return false;

    foreach(lc, b)
    {
        int         x = lfirst_int(lc);

        if (x < 0)
            elog(ERROR, "negative bitmapset member not allowed");
        wordnum = WORDNUM(x);
        bitnum = BITNUM(x);
        if (wordnum < a->nwords)
            if ((a->words[wordnum] & ((bitmapword) 1 << bitnum)) != 0)
                return true;
    }

    return false;
}

bms_prev_member()

int bms_prev_member	(	const Bitmapset *	a,
		int	prevbit
	)

Definition at line 1102 of file bitmapset.c.

References BITNUM, BITS_PER_BITMAPWORD, bmw_leftmost_one_pos, Bitmapset::nwords, WORDNUM, and Bitmapset::words.

Referenced by choose_next_subplan_locally().

{
    int         wordnum;
    int         ushiftbits;
    bitmapword  mask;

    /*
     * If set is NULL or if there are no more bits to the right then we've
     * nothing to do.
     */
    if (a == NULL || prevbit == 0)
        return -2;

    /* transform -1 to the highest possible bit we could have set */
    if (prevbit == -1)
        prevbit = a->nwords * BITS_PER_BITMAPWORD - 1;
    else
        prevbit--;

    ushiftbits = BITS_PER_BITMAPWORD - (BITNUM(prevbit) + 1);
    mask = (~(bitmapword) 0) >> ushiftbits;
    for (wordnum = WORDNUM(prevbit); wordnum >= 0; wordnum--)
    {
        bitmapword  w = a->words[wordnum];

        /* mask out bits left of prevbit */
        w &= mask;

        if (w != 0)
        {
            int         result;

            result = wordnum * BITS_PER_BITMAPWORD;
            result += bmw_leftmost_one_pos(w);
            return result;
        }

        /* in subsequent words, consider all bits */
        mask = (~(bitmapword) 0);
    }
    return -2;
}

bms_singleton_member()

int bms_singleton_member

(

const Bitmapset *

a

)

Definition at line 577 of file bitmapset.c.

References BITS_PER_BITMAPWORD, bmw_rightmost_one_pos, elog, ERROR, HAS_MULTIPLE_ONES, Bitmapset::nwords, and Bitmapset::words.

Referenced by distribute_restrictinfo_to_rels(), examine_variable(), find_join_input_rel(), fix_append_rel_relids(), and remove_useless_joins().

{
    int         result = -1;
    int         nwords;
    int         wordnum;

    if (a == NULL)
        elog(ERROR, "bitmapset is empty");
    nwords = a->nwords;
    for (wordnum = 0; wordnum < nwords; wordnum++)
    {
        bitmapword  w = a->words[wordnum];

        if (w != 0)
        {
            if (result >= 0 || HAS_MULTIPLE_ONES(w))
                elog(ERROR, "bitmapset has multiple members");
            result = wordnum * BITS_PER_BITMAPWORD;
            result += bmw_rightmost_one_pos(w);
        }
    }
    if (result < 0)
        elog(ERROR, "bitmapset is empty");
    return result;
}

bms_subset_compare()

BMS_Comparison bms_subset_compare	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 352 of file bitmapset.c.

References BMS_DIFFERENT, BMS_EQUAL, bms_is_empty(), BMS_SUBSET1, BMS_SUBSET2, i, Min, Bitmapset::nwords, and Bitmapset::words.

Referenced by add_path(), consider_index_join_outer_rels(), estimate_multivariate_ndistinct(), remove_useless_groupby_columns(), and set_cheapest().

{
    BMS_Comparison result;
    int         shortlen;
    int         longlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
    {
        if (b == NULL)
            return BMS_EQUAL;
        return bms_is_empty(b) ? BMS_EQUAL : BMS_SUBSET1;
    }
    if (b == NULL)
        return bms_is_empty(a) ? BMS_EQUAL : BMS_SUBSET2;
    /* Check common words */
    result = BMS_EQUAL;         /* status so far */
    shortlen = Min(a->nwords, b->nwords);
    for (i = 0; i < shortlen; i++)
    {
        bitmapword  aword = a->words[i];
        bitmapword  bword = b->words[i];

        if ((aword & ~bword) != 0)
        {
            /* a is not a subset of b */
            if (result == BMS_SUBSET1)
                return BMS_DIFFERENT;
            result = BMS_SUBSET2;
        }
        if ((bword & ~aword) != 0)
        {
            /* b is not a subset of a */
            if (result == BMS_SUBSET2)
                return BMS_DIFFERENT;
            result = BMS_SUBSET1;
        }
    }
    /* Check extra words */
    if (a->nwords > b->nwords)
    {
        longlen = a->nwords;
        for (; i < longlen; i++)
        {
            if (a->words[i] != 0)
            {
                /* a is not a subset of b */
                if (result == BMS_SUBSET1)
                    return BMS_DIFFERENT;
                result = BMS_SUBSET2;
            }
        }
    }
    else if (a->nwords < b->nwords)
    {
        longlen = b->nwords;
        for (; i < longlen; i++)
        {
            if (b->words[i] != 0)
            {
                /* b is not a subset of a */
                if (result == BMS_SUBSET2)
                    return BMS_DIFFERENT;
                result = BMS_SUBSET1;
            }
        }
    }
    return result;
}

bms_union()

Bitmapset* bms_union	(	const Bitmapset *	a,
		const Bitmapset *	b
	)

Definition at line 225 of file bitmapset.c.

References bms_copy(), i, Bitmapset::nwords, and Bitmapset::words.

Referenced by build_child_join_rel(), build_join_rel(), BuildParameterizedTidPaths(), calc_nestloop_required_outer(), calc_non_nestloop_required_outer(), check_index_predicates(), check_relation_privileges(), compute_semijoin_info(), consider_index_join_outer_rels(), create_join_clause(), create_nestloop_path(), create_nestloop_plan(), deconstruct_recurse(), ExecConstraints(), ExecPartitionCheckEmitError(), ExecWithCheckOptions(), finalize_plan(), foreign_join_ok(), generate_base_implied_equalities_const(), generate_base_implied_equalities_no_const(), generate_join_implied_equalities(), generate_join_implied_equalities_for_ecs(), generate_nonunion_paths(), generate_recursion_path(), generate_union_paths(), get_baserel_parampathinfo(), get_joinrel_parampathinfo(), has_legal_joinclause(), join_is_removable(), make_join_rel(), make_outerjoininfo(), make_restrictinfo_internal(), min_join_parameterization(), postgresGetForeignPaths(), postgresPlanForeignModify(), pull_up_sublinks_jointree_recurse(), reduce_unique_semijoins(), remove_useless_joins(), substitute_phv_relids_walker(), and try_partitionwise_join().

{
    Bitmapset  *result;
    const Bitmapset *other;
    int         otherlen;
    int         i;

    /* Handle cases where either input is NULL */
    if (a == NULL)
        return bms_copy(b);
    if (b == NULL)
        return bms_copy(a);
    /* Identify shorter and longer input; copy the longer one */
    if (a->nwords <= b->nwords)
    {
        result = bms_copy(b);
        other = a;
    }
    else
    {
        result = bms_copy(a);
        other = b;
    }
    /* And union the shorter input into the result */
    otherlen = other->nwords;
    for (i = 0; i < otherlen; i++)
        result->words[i] |= other->words[i];
    return result;
}