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Enhanced cycle mark values

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Per SQL:202x draft, in the CYCLE clause of a recursive query, the
cycle mark values can be of type boolean and can be omitted, in which
case they default to TRUE and FALSE.

Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Discussion: https://www.postgresql.org/message-id/flat/db80ceee-6f97-9b4a-8ee8-3ba0c58e5be2@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2021-02-27 08:11:14 +01:00
parent 4e90052c46
commit f4adc41c4f
7 changed files with 144 additions and 47 deletions
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19
src/backend/utils/adt/ruleutils.c
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@ -5208,10 +5208,21 @@ get_with_clause(Query *query, deparse_context *context)
}
appendStringInfo(buf, " SET %s", quote_identifier(cte->cycle_clause->cycle_mark_column));
appendStringInfoString(buf, " TO ");
get_rule_expr(cte->cycle_clause->cycle_mark_value, context, false);
appendStringInfoString(buf, " DEFAULT ");
get_rule_expr(cte->cycle_clause->cycle_mark_default, context, false);
{
Const *cmv = castNode(Const, cte->cycle_clause->cycle_mark_value);
Const *cmd = castNode(Const, cte->cycle_clause->cycle_mark_default);
if (!(cmv->consttype == BOOLOID && !cmv->constisnull && DatumGetBool(cmv->constvalue) == true &&
cmd->consttype == BOOLOID && !cmd->constisnull && DatumGetBool(cmd->constvalue) == false))
{
appendStringInfoString(buf, " TO ");
get_rule_expr(cte->cycle_clause->cycle_mark_value, context, false);
appendStringInfoString(buf, " DEFAULT ");
get_rule_expr(cte->cycle_clause->cycle_mark_default, context, false);
}
}
appendStringInfo(buf, " USING %s", quote_identifier(cte->cycle_clause->cycle_path_column));
}