[SQL] Avoid String parsing in BeamTableUtils
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sql
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Description
Looks like we're going through DateTime parsing on each projection:
https://github.com/apache/beam/blob/9319ce18ac625b239c8cdc1b32e2b697d83c2504/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rel/BeamCalcRel.java#L125
https://github.com/apache/beam/blob/9ef5e8690871737cccfe513ac00481320f662c18/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/schema/BeamTableUtils.java#L110
We should avoid unnecessary casting and parsing
Imported from Jira [BEAM-5127](https://issues.apache.org/jira/browse/BEAM-5127). Original Jira may contain additional context.
Reported by: kedin.
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