[CALCITE-7681] SqlDatetimeSubtractionOperator drops parentheses around compound interval expressions - #5135
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…d compound interval expressions
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Jira Link
CALCITE-7681
Changes Proposed
Apply the datetime operator's precedence when unparsing its operands. This preserves the compound interval in SQL such as:
Previously, RelToSql flattened the right operand and changed the expression's meaning:
Add regression coverage for the default and Spark dialects.