[jira] [Created] (CALCITE-5179) supportsAliasedValues() false generates assertion-failing UNION ALL SqlNode

["Steven Talbot (Jira)" <ji...@apache.org>]

Steven Talbot created CALCITE-5179:
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             Summary: supportsAliasedValues() false generates assertion-failing UNION ALL SqlNode
                 Key: CALCITE-5179
                 URL: https://issues.apache.org/jira/browse/CALCITE-5179
             Project: Calcite
          Issue Type: Bug
            Reporter: Steven Talbot


The code at [https://github.com/apache/calcite/blob/4b349032c17b95735b12593a65f7027d54d8b8b6/core/src/main/java/org/apache/calcite/rel/rel2sql/RelToSqlConverter.java#L802-L803] creates a UNION ALL with an arbitrary number of operands, but [the UNION_ALL operator is a SqlSetOperator|https://github.com/apache/calcite/blob/4b349032c17b95735b12593a65f7027d54d8b8b6/core/src/main/java/org/apache/calcite/sql/fun/SqlStdOperatorTable.java#L108-L109] which is a "SqlBinaryOperator" (Binary syntax). So that generates an assertion error when it unparses more than two values at [https://github.com/apache/calcite/blob/4b349032c17b95735b12593a65f7027d54d8b8b6/core/src/main/java/org/apache/calcite/sql/SqlUtil.java#L426]

 

I don't _think_ I've done anything nonstandard, other than use a dialect with that flag set to false. To reproduce, create a values RelNode with more than two items, convert it with RelToSqlConverter with a dialect using supportsAliasedValues() = false (like Redshift), and attempt to unparse the resulting SqlNode.



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