sepuri sai krishna created FLINK-40726:
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Summary: Reading a key from a map returned by MAP_FROM_ARRAYS /
MAP_FROM_ENTRIES / MAP_UNION fails with ClassCastException
Key: FLINK-40726
URL: https://issues.apache.org/jira/browse/FLINK-40726
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Affects Versions: 2.4.0
Reporter: sepuri sai krishna
Key access on a map produced by {{MAP_FROM_ARRAYS}}, {{MAP_FROM_ENTRIES}} or
{{MAP_UNION}} fails at runtime:
{code:sql}
SELECT MAP_FROM_ARRAYS(k, v)['a'] FROM src;
{code}
{noformat}
java.lang.ClassCastException: class
org.apache.flink.table.runtime.util.MapDataContainer
cannot be cast to class org.apache.flink.table.data.GenericMapData
at BatchExecCalc$21.processElement(Unknown Source)
{noformat}
The same happens for {{MAP_FROM_ENTRIES}} and {{MAP_UNION}}. It fails in the
generated operator while processing records, so the job fails rather than
returning a wrong result. A map literal is unaffected: {{SELECT
MAP['a',1]['a']}}
returns 1.
Reproduced on master against a table source, so not constant folding. I have a
fix and tests ready, could someone assign this to me?
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