leonardBang opened a new pull request #1491: [CALCITE-3368] Some problems simplifying ‘expression IS NULL’ URL: https://github.com/apache/calcite/pull/1491 [CALCITE-3368] Some problems simplifying ‘expression IS NULL’ (Leonard Xu) Close apache/calcite#3368 * Mark TIMES、PLUS、MINUS、PLUS_PREFIX、MINUS_PREFIX as unsafe operators * Add judgement for safe expression in both IsNull and IsNotNull * Add related test cases in RexProgramTest
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