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Add CREATE COLLATION IF NOT EXISTS clause

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The core of the functionality was already implemented when
pg_import_system_collations was added.  This just exposes it as an
option in the SQL command.
This commit is contained in:
Peter Eisentraut
2017-02-08 22:51:09 -05:00
parent e403732ef6
commit 6d16ecc646
10 changed files with 47 additions and 6 deletions
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src/include/commands/collationcmds.h
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@@ -18,7 +18,7 @@
#include "catalog/objectaddress.h"
#include "nodes/parsenodes.h"
extern ObjectAddress DefineCollation(ParseState *pstate, List *names, List *parameters);
extern ObjectAddress DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_exists);
extern void IsThereCollationInNamespace(const char *collname, Oid nspOid);
#endif /* COLLATIONCMDS_H */