greenplumn cdbsubselect 源码
greenplumn cdbsubselect 代码
文件路径：/src/include/cdb/cdbsubselect.h
/*-------------------------------------------------------------------------
*
* cdbsubselect.c
* Flattens subqueries, transforms them to joins.
*
* Portions Copyright (c) 2007-2008, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/cdb/cdbsubselect.h
*
*-------------------------------------------------------------------------
*/
#ifndef CDBSUBSELECT_H
#define CDBSUBSELECT_H
struct Node; /* #include "nodes/nodes.h" */
struct PlannerInfo; /* #include "nodes/relation.h" */
extern JoinExpr *convert_EXPR_to_join(PlannerInfo *root, OpExpr *opexp);
extern bool has_correlation_in_funcexpr_rte(List *rtable);
extern bool is_simple_subquery(PlannerInfo *root, Query *subquery, RangeTblEntry *rte,
JoinExpr *lowest_outer_join);
extern JoinExpr *convert_IN_to_antijoin(PlannerInfo *root, SubLink *sublink, Relids available_rels);
#endif /* CDBSUBSELECT_H */
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