Feng Zhu created CALCITE-3081:
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Summary: Literal NULL should be generated in SqlDialect
Key: CALCITE-3081
URL: https://issues.apache.org/jira/browse/CALCITE-3081
Project: Calcite
Issue Type: Bug
Affects Versions: 1.19.0
Reporter: Feng Zhu
In Calcite, this simple query will throw exception during validation, even it
is ok in many databases.
{code:java}
Query:
final String query = "select NULL as col "
+ "from \"foodmart\".\"product\"";
Exception
org.apache.calcite.tools.ValidationException:
org.apache.calcite.runtime.CalciteContextException: From line 1, column 8 to
line 1, column 11: Illegal use of 'NULL'
{code}
The right way to use 'NULL' in Calcite is:
{code:java}
final String query = "select cast(NULL as integer) as col "
+ "from \"foodmart\".\"product\"";
{code}
However, the converted query by *RelToSqlConverter* is illegal in Calcite
again.
{code:java}
SELECT NULL AS \"COL\"
FROM \"foodmart\".\"product\"
{code}
The issue is trivial, but it is against to general sense. Maybe we can generate
NULL literal in SqlDialect?
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