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SQL/JSON: Correctly enforce the default ON EMPTY behavior

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Currently, when the ON EMPTY clause is not present, the ON ERROR
clause (implicit or explicit) dictates the behavior when jsonpath
evaluation in ExecEvalJsonExprPath() results in an empty sequence.
That is an oversight in the commit 6185c9737c.

This commit fixes things so that a NULL is returned instead in that
case which is the default behavior when the ON EMPTY clause is not
present.

Reported-by: Markus Winand
Discussion: https://postgr.es/m/F7DD1442-265C-4220-A603-CB0DEB77E91D%40winand.at
This commit is contained in:
Amit Langote
2024-06-19 15:22:59 +09:00
parent 0f271e8e8d
commit 03ec203164
5 changed files with 64 additions and 40 deletions
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8
src/test/regress/sql/sqljson_jsontable.sql
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@ -118,19 +118,19 @@ FROM json_table_test vals
-- Test using casts in DEFAULT .. ON ERROR expression
SELECT * FROM JSON_TABLE(jsonb '{"d1": "H"}', '$'
COLUMNS (js1 jsonb_test_domain PATH '$.a2' DEFAULT '"foo1"'::jsonb::text ON ERROR));
COLUMNS (js1 jsonb_test_domain PATH '$.a2' DEFAULT '"foo1"'::jsonb::text ON EMPTY));
SELECT * FROM JSON_TABLE(jsonb '{"d1": "H"}', '$'
COLUMNS (js1 jsonb_test_domain PATH '$.a2' DEFAULT 'foo'::jsonb_test_domain ON ERROR));
COLUMNS (js1 jsonb_test_domain PATH '$.a2' DEFAULT 'foo'::jsonb_test_domain ON EMPTY));
SELECT * FROM JSON_TABLE(jsonb '{"d1": "H"}', '$'
COLUMNS (js1 jsonb_test_domain PATH '$.a2' DEFAULT 'foo1'::jsonb_test_domain ON ERROR));
COLUMNS (js1 jsonb_test_domain PATH '$.a2' DEFAULT 'foo1'::jsonb_test_domain ON EMPTY));
SELECT * FROM JSON_TABLE(jsonb '{"d1": "foo"}', '$'
COLUMNS (js1 jsonb_test_domain PATH '$.d1' DEFAULT 'foo2'::jsonb_test_domain ON ERROR));
SELECT * FROM JSON_TABLE(jsonb '{"d1": "foo"}', '$'
COLUMNS (js1 oid[] PATH '$.d2' DEFAULT '{1}'::int[]::oid[] ON ERROR));
COLUMNS (js1 oid[] PATH '$.d2' DEFAULT '{1}'::int[]::oid[] ON EMPTY));
-- JSON_TABLE: Test backward parsing