e665769e6d
IF NOT EXISTS was ignored when specified in an EXPLAIN query for CREATE MATERIALIZED VIEW or CREATE TABLE AS. Hence, if this clause was specified, the caller would get a failure if the relation already exists instead of a success with a NOTICE message. This commit makes the behavior of IF NOT EXISTS in EXPLAIN consistent with the non-EXPLAIN'd DDL queries, preventing a failure with IF NOT EXISTS if the relation to-be-created already exists. The skip is done before the SELECT query used for the relation is planned or executed, and a "dummy" plan is generated instead depending on the format used by EXPLAIN. Author: Bharath Rupireddy Reviewed-by: Zhijie Hou, Michael Paquier Discussion: https://postgr.es/m/CALj2ACVa3oJ9O_wcGd+FtHWZds04dEKcakxphGz5POVgD4wC7Q@mail.gmail.com
35 lines
989 B
C
35 lines
989 B
C
/*-------------------------------------------------------------------------
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*
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* createas.h
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* prototypes for createas.c.
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*
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*
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* Portions Copyright (c) 1996-2020, 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/commands/createas.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef CREATEAS_H
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#define CREATEAS_H
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#include "catalog/objectaddress.h"
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#include "nodes/params.h"
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#include "parser/parse_node.h"
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#include "tcop/dest.h"
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#include "utils/queryenvironment.h"
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extern ObjectAddress ExecCreateTableAs(ParseState *pstate, CreateTableAsStmt *stmt,
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ParamListInfo params, QueryEnvironment *queryEnv,
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QueryCompletion *qc);
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extern int GetIntoRelEFlags(IntoClause *intoClause);
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extern DestReceiver *CreateIntoRelDestReceiver(IntoClause *intoClause);
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extern bool CreateTableAsRelExists(CreateTableAsStmt *ctas);
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#endif /* CREATEAS_H */
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