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87c21bb941
This new DDL command splits a single partition into several parititions. Just like ALTER TABLE ... MERGE PARTITIONS ... command, new patitions are created using createPartitionTable() function with parent partition as the template. This commit comprises quite naive implementation which works in single process and holds the ACCESS EXCLUSIVE LOCK on the parent table during all the operations including the tuple routing. This is why this new DDL command can't be recommended for large partitioned tables under a high load. However, this implementation come in handy in certain cases even as is. Also, it could be used as a foundation for future implementations with lesser locking and possibly parallel. Discussion: https://postgr.es/m/c73a1746-0cd0-6bdd-6b23-3ae0b7c0c582%40postgrespro.ru Author: Dmitry Koval Reviewed-by: Matthias van de Meent, Laurenz Albe, Zhihong Yu, Justin Pryzby Reviewed-by: Alvaro Herrera, Robert Haas, Stephane Tachoires
54 lines
2 KiB
C
54 lines
2 KiB
C
/*-------------------------------------------------------------------------
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*
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* ruleutils.h
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* Declarations for ruleutils.c
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*
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* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/ruleutils.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef RULEUTILS_H
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#define RULEUTILS_H
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#include "nodes/nodes.h"
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#include "nodes/parsenodes.h"
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#include "nodes/pg_list.h"
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struct Plan; /* avoid including plannodes.h here */
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struct PlannedStmt;
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/* Flags for pg_get_indexdef_columns_extended() */
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#define RULE_INDEXDEF_PRETTY 0x01
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#define RULE_INDEXDEF_KEYS_ONLY 0x02 /* ignore included attributes */
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extern char *pg_get_indexdef_string(Oid indexrelid);
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extern char *pg_get_indexdef_columns(Oid indexrelid, bool pretty);
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extern char *pg_get_indexdef_columns_extended(Oid indexrelid,
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bits16 flags);
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extern char *pg_get_querydef(Query *query, bool pretty);
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extern char *pg_get_partkeydef_columns(Oid relid, bool pretty);
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extern char *pg_get_partconstrdef_string(Oid partitionId, char *aliasname);
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extern char *pg_get_constraintdef_command(Oid constraintId);
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extern char *deparse_expression(Node *expr, List *dpcontext,
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bool forceprefix, bool showimplicit);
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extern List *deparse_context_for(const char *aliasname, Oid relid);
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extern List *deparse_context_for_plan_tree(struct PlannedStmt *pstmt,
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List *rtable_names);
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extern List *set_deparse_context_plan(List *dpcontext,
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struct Plan *plan, List *ancestors);
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extern List *select_rtable_names_for_explain(List *rtable,
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Bitmapset *rels_used);
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extern char *generate_collation_name(Oid collid);
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extern char *generate_opclass_name(Oid opclass);
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extern char *get_range_partbound_string(List *bound_datums);
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extern char *pg_get_statisticsobjdef_string(Oid statextid);
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extern char *get_list_partvalue_string(Const *val);
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#endif /* RULEUTILS_H */
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