Mihai Budiu created CALCITE-5987:
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Summary: SqlImplementor loses type information for literals
Key: CALCITE-5987
URL: https://issues.apache.org/jira/browse/CALCITE-5987
Project: Calcite
Issue Type: Improvement
Components: core
Affects Versions: 1.35.0
Reporter: Mihai Budiu
When converting a SqlNode to a String query, the conversion can produce SQL
that computes different results. This happens because literals do not carry
type information in the result string. For example, this plan:
{code}
rel#7:LogicalValues.(type=RecordType(VARCHAR(3) EXPR$0),tuples=[{ 'A' }])
{code}
will generate a SQL query:
{code}
SELECT 'A'
{code}
While the type of the former result is VARCHAR(3), the latter query produces a
CHAR(1) result.
It would be nice if SqlImplementor had an option to produce a query that
preserves the output type, e.g.:
{code}
SELECT (CAST 'A' as VARCHAR(3))
{code}
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