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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