xuyang created FLINK-24914:
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Summary: Support implicit type conversion in SQL like "select
int_field = varchar_field"
Key: FLINK-24914
URL: https://issues.apache.org/jira/browse/FLINK-24914
Project: Flink
Issue Type: Improvement
Reporter: xuyang
Before, "select int_field = varchar_field" will be converted to
"BinaryStringData.equals (int xxx)", so we always get FALSE.
Currently, we temporarily forbid "=" and "<>" between numeric and (var)char
fields in SQL API, just like what have been done in Table API.
In future, we can support the implicit type conversion in Flink SQL and let
this kind of SQL have the correct result.
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