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postgres_fdw: Allow fetch_size to be set per-table or per-server.

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The default fetch size of 100 rows might not be right in every
environment, so allow users to configure it.

Corey Huinker, reviewed by Kyotaro Horiguchi, Andres Freund, and me.
This commit is contained in:
Robert Haas
2016-02-03 09:01:59 -05:00
parent e6ecc93a17
commit dc203dc3ac
6 changed files with 180 additions and 17 deletions
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14
contrib/postgres_fdw/option.c
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@ -131,6 +131,17 @@ postgres_fdw_validator(PG_FUNCTION_ARGS)
/* check list syntax, warn about uninstalled extensions */
(void) ExtractExtensionList(defGetString(def), true);
}
else if (strcmp(def->defname, "fetch_size") == 0)
{
int fetch_size;
fetch_size = strtol(defGetString(def), NULL,10);
if (fetch_size <= 0)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("%s requires a non-negative integer value",
def->defname)));
}
}
PG_RETURN_VOID();
@ -162,6 +173,9 @@ InitPgFdwOptions(void)
/* updatable is available on both server and table */
{"updatable", ForeignServerRelationId, false},
{"updatable", ForeignTableRelationId, false},
/* fetch_size is available on both server and table */
{"fetch_size", ForeignServerRelationId, false},
{"fetch_size", ForeignTableRelationId, false},
{NULL, InvalidOid, false}
};