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SQL/JSON: Prevent ON EMPTY for EXISTS columns in JSON_TABLE()
Due to an oversight in de3600452b
, the ON EMPTY clause was
incorrectly allowed in the EXISTS column. Fix the grammar to prevent
this.
Discussion: https://postgr.es/m/CA%2BHiwqHh3YDXTpccgAo4CdfV9Mhy%2Bmg%3Doh6t8rfM5uLW1BJN4g%40mail.gmail.com
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@ -14265,7 +14265,7 @@ json_table_column_definition:
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}
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| ColId Typename
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EXISTS json_table_column_path_clause_opt
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json_behavior_clause_opt
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json_on_error_clause_opt
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{
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JsonTableColumn *n = makeNode(JsonTableColumn);
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@ -14276,8 +14276,8 @@ json_table_column_definition:
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n->wrapper = JSW_NONE;
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n->quotes = JS_QUOTES_UNSPEC;
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n->pathspec = (JsonTablePathSpec *) $4;
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n->on_empty = (JsonBehavior *) linitial($5);
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n->on_error = (JsonBehavior *) lsecond($5);
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n->on_empty = NULL;
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n->on_error = (JsonBehavior *) $5;
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n->location = @1;
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$$ = (Node *) n;
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}
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@ -1067,3 +1067,8 @@ CREATE OR REPLACE VIEW public.jsonb_table_view7 AS
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) sub
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DROP VIEW jsonb_table_view7;
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DROP TABLE s;
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-- Prevent ON EMPTY specification on EXISTS columns
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SELECT * FROM JSON_TABLE(jsonb '1', '$' COLUMNS (a int exists empty object on empty));
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ERROR: syntax error at or near "empty"
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LINE 1: ...sonb '1', '$' COLUMNS (a int exists empty object on empty));
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^
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@ -518,3 +518,6 @@ SELECT sub.* FROM s,
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\sv jsonb_table_view7
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DROP VIEW jsonb_table_view7;
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DROP TABLE s;
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-- Prevent ON EMPTY specification on EXISTS columns
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SELECT * FROM JSON_TABLE(jsonb '1', '$' COLUMNS (a int exists empty object on empty));
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