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SQL/JSON: Improve some error messages

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This improves some error messages emitted by SQL/JSON query functions
by mentioning column name when available, such as when they are
invoked as part of evaluating JSON_TABLE() columns.  To do so, a new
field column_name is added to both JsonFuncExpr and JsonExpr that is
only populated when creating those nodes for transformed JSON_TABLE()
columns.

While at it, relevant error messages are reworded for clarity.

Reported-by: Jian He <jian.universality@gmail.com>
Suggested-by: Jian He <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CACJufxG_e0QLCgaELrr2ZNz7AxPeGCNKAORe3fHtFCQLsH4J4Q@mail.gmail.com
This commit is contained in:
Amit Langote
2024-04-18 14:33:47 +09:00
parent 40126ac68f
commit b4fad46b6b
10 changed files with 100 additions and 61 deletions
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3
src/test/regress/sql/sqljson_jsontable.sql
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@ -290,6 +290,9 @@ FROM JSON_TABLE(
-- Should fail (not supported)
SELECT * FROM JSON_TABLE(jsonb '{"a": 123}', '$' || '.' || 'a' COLUMNS (foo int));
-- JsonPathQuery() error message mentioning column name
SELECT * FROM JSON_TABLE('{"a": [{"b": "1"}, {"b": "2"}]}', '$' COLUMNS (b json path '$.a[*].b' ERROR ON ERROR));
-- JSON_TABLE: nested paths
-- Duplicate path names