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Common SQL/JSON clauses

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This introduces some of the building blocks used by the SQL/JSON
constructor and query functions. Specifically, it provides node
executor and grammar support for the FORMAT JSON [ENCODING foo]
clause, and values decorated with it, and for the RETURNING clause.

The following SQL/JSON patches will leverage these.

Nikita Glukhov (who probably deserves an award for perseverance).

Reviewers have included (in no particular order) Andres Freund, Alexander
Korotkov, Pavel Stehule, Andrew Alsup. Erik Rijkers, Zihong Yu and
Himanshu Upadhyaya.

Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru
This commit is contained in:
Andrew Dunstan
2022-03-03 13:00:49 -05:00
parent a3b071bbe0
commit 865fe4d5df
17 changed files with 758 additions and 2 deletions
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23
src/backend/optimizer/util/clauses.c
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@@ -3512,6 +3512,29 @@ eval_const_expressions_mutator(Node *node,
return ece_evaluate_expr((Node *) newcre);
return (Node *) newcre;
}
case T_JsonValueExpr:
{
JsonValueExpr *jve = (JsonValueExpr *) node;
Node *raw = eval_const_expressions_mutator((Node *) jve->raw_expr,
context);
if (raw && IsA(raw, Const))
{
Node *formatted;
Node *save_case_val = context->case_val;
context->case_val = raw;
formatted = eval_const_expressions_mutator((Node *) jve->formatted_expr,
context);
context->case_val = save_case_val;
if (formatted && IsA(formatted, Const))
return formatted;
}
break;
}
default:
break;
}