[CALCITE-7777] JDBC adapter generates || for concatenation, which SQL Server rejects - #5258
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mihaibudiu
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I hope that the precedence is right for the operator
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LGTM-will-merge-soon
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Jira Link
CALCITE-7777
Changes Proposed
MssqlSqlDialectwrites the||operator as+. SQL Server has no||, and+is the only rendering that keeps what||means: it propagates NULL, where theCONCATfunction reads a NULL operand as the empty string and would turn a NULL result into a row.