Oliver Lee created CALCITE-6662:
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Summary: RelJson.rangePointFromJson cannot create Double numerics
Key: CALCITE-6662
URL: https://issues.apache.org/jira/browse/CALCITE-6662
Project: Calcite
Issue Type: Task
Reporter: Oliver Lee
Following CALCITE-2067, RexLiteral has more accurate validation between using
exact numerics vs approximate numerics to create RexLiterals.
[RelJson.rangeEndPointFromJson|https://github.com/apache/calcite/blob/2e99d5118efbba21c87e7da08b8359ce296e138d/core/src/main/java/org/apache/calcite/rel/externalize/RelJson.java#L940]
however only creates all numerics using BigDecimal, and this causes errors to
be thrown when deserializing rel jsons
[here|https://github.com/apache/calcite/blob/2e99d5118efbba21c87e7da08b8359ce296e138d/core/src/main/java/org/apache/calcite/rex/RexLiteral.java#L234].
I believe the fix would be to allow rangeEndPointFromJson to attempt to cast to
`Double` first, check if it is the same value prior to casting, otherwise
continue to cast as BigDecimal, which we use for exact numerics.
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