Arnab Karmakar created IMPALA-15225:
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Summary: Add DEFAULT keyword for Iceberg V3 default values
Key: IMPALA-15225
URL: https://issues.apache.org/jira/browse/IMPALA-15225
Project: IMPALA
Issue Type: Improvement
Components: Backend, Frontend
Reporter: Arnab Karmakar
Add DEFAULT keyword support for Iceberg V3 default values for queries like:
{code:java}
INSERT INTO orders VALUES (101, DEFAULT, DEFAULT);
UPDATE … SET status = DEFAULT WHERE …; {code}
This ticket is currently on hold because this requires Calcite support.
`{{{}KW_DEFAULT`{}}} is currently in {{{}`ident_or_unreserved{}}}` and it can
appear as a column reference
[(link)|https://github.com/apache/impala/blob/05ffd62a742a7bc21990b0777962b29cfce0fdb3/fe/src/main/cup/sql-parser.cup#L4558].
If we also try to use bare {{KW_DEFAULT}} as a value-expression in the same
grammar, we get a ** conflict. Its because Impala uses LALR(1) parser that
causes ambiguity when adding the new keyword.
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