DonnyZone opened a new pull request #1724: [CALCITE-3675] SQL to Rel conversion is broken for coalesce on nullable field URL: https://github.com/apache/calcite/pull/1724 The issue is introduced by [CALCITE-3355](https://issues.apache.org/jira/browse/CALCITE-3355), in which type deducing is only conducted in validation phase. However, when converting to RexNode, a new `SqlOperatorBinding` (i.e., `RexCallBinding`) is used. Consequently, it fails type preservation check. This PR tries to fill the gap.
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