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SQL/JSON: Fix issues with DEFAULT .. ON ERROR / EMPTY

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SQL/JSON query functions allow specifying an expression to return
when either of ON ERROR or ON EMPTY condition occurs when evaluating
the JSON path expression.  The parser (transformJsonBehavior()) checks
that the specified expression is one of the supported expressions, but
there are two issues with how the check is done that are fixed in this
commit:

* No check for some expressions related to coercion, such as
  CoerceViaIO, that may appear in the transformed user-specified
  expressions that include cast(s)

* An unsupported expression may be masked by a coercion-related
  expression, which must be flagged by checking the latter's
  argument expression recursively

Author: Jian He <jian.universality@gmail.com>
Author: Amit Langote <amitlangote09@gmail.com>
Reported-by: Jian He <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CACJufxEqhqsfrg_p7EMyo5zak3d767iFDL8vz_4%3DZBHpOtrghw@mail.gmail.com
Discussion: https://postgr.es/m/CACJufxGOerH1QJknm1noh-Kz5FqU4p7QfeZSeVT2tN_4SLXYNg@mail.gmail.com
This commit is contained in:
Amit Langote
2024-04-18 14:46:35 +09:00
parent b4fad46b6b
commit c0fc075186
5 changed files with 167 additions and 2 deletions
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16
src/test/regress/sql/sqljson_jsontable.sql
View File

@ -116,6 +116,22 @@ FROM json_table_test vals
) jt
ON true;
-- 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));
SELECT * FROM JSON_TABLE(jsonb '{"d1": "H"}', '$'
COLUMNS (js1 jsonb_test_domain PATH '$.a2' DEFAULT 'foo'::jsonb_test_domain ON ERROR));
SELECT * FROM JSON_TABLE(jsonb '{"d1": "H"}', '$'
COLUMNS (js1 jsonb_test_domain PATH '$.a2' DEFAULT 'foo1'::jsonb_test_domain ON ERROR));
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));
-- JSON_TABLE: Test backward parsing
CREATE VIEW jsonb_table_view2 AS