[SQL] Enable flattening configuration
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dsl
improvement
P3
sql
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- Java
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Description
Currently the calcite projection also flattens the output row in PlannerImpl.
This causes failure when inserting into a table with a ROW field.
E.g. `INSERT INTO table (f_row_destination) SELECT f_row_source` will not work, as f_row_source will be flattened into separate fields and won't match the destination schema
Imported from Jira [BEAM-4514](https://issues.apache.org/jira/browse/BEAM-4514). Original Jira may contain additional context.
Reported by: kedin.
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