vvysotskyi opened a new pull request #1528: DRILL-3610: Fix TIMESTAMPADD and TIMESTAMPDIFF functions URL: https://github.com/apache/drill/pull/1528 - Added type inference for TIMESTAMPADD function to avoid failures for the cases when function types are checked for expressions before and after rewriting. - Added custom convertlet for TIMESTAMPDIFF function to avoid rewriting it by Calcite, since Drill does not support Reinterpret function and does not handle all Calcite interval representations correctly. - Added UDFs for TIMESTAMPDIFF for all supported time units. The mechanism is similar to the existing EXTRACT function: when Calcite RexCall is converted to the Drill LogicalExpression, a function name is changed to timestampdiffSecond or similar one depending on the specified time unit. For problem description please see [DRILL-3610](https://issues.apache.org/jira/browse/DRILL-3610).
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