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Posted to issues@calcite.apache.org by "Jiajun Xie (Jira)" <ji...@apache.org> on 2022/06/04 08:19:00 UTC
[jira] [Commented] (CALCITE-5179) AssertionError in values with more than two items when SqlDialect#supportsAliasedValues is false
[ https://issues.apache.org/jira/browse/CALCITE-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547923#comment-17547923 ]
Jiajun Xie commented on CALCITE-5179:
-------------------------------------
[~swtalbot], the problem only in values with more than two items, so I changed the title.
BTW, union query with more than two input is correct. See https://issues.apache.org/jira/browse/CALCITE-1586
> AssertionError in values with more than two items when SqlDialect#supportsAliasedValues is false
> ------------------------------------------------------------------------------------------------
>
> Key: CALCITE-5179
> URL: https://issues.apache.org/jira/browse/CALCITE-5179
> Project: Calcite
> Issue Type: Bug
> Reporter: Steven Talbot
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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