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https://issues.apache.org/jira/browse/CALCITE-3419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952685#comment-16952685
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Danny Chen commented on CALCITE-3419:
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You can use SqlImplementor#toSql[1] to convert RexNode to SqlNode then use
SqlNode#toSqlString to convert it to SQL-like string.
[1]
https://github.com/apache/calcite/blob/3cbbafa941128dc5097c2a26711f5751f764e12d/core/src/main/java/org/apache/calcite/rel/rel2sql/SqlImplementor.java#L480
> Tools for converting List<RexNode> to SQL expression string
> ------------------------------------------------------------
>
> Key: CALCITE-3419
> URL: https://issues.apache.org/jira/browse/CALCITE-3419
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: jamie12221
> Priority: Trivial
>
> 'org.apache.calcite.schema.ProjectableFilterableTable' Is a simple tool that
> can apply filter expressions.On a datasource that uses SQL as a query
> command, the org.apache.calcite.schema.ProjectableFilterableTable#scan method
> applies a filter expression, and the filter expression may be converted to
> SQL. I have not found a way to convert List<RexNode> to SQL. In particular,
> OR expressions may involve some complicated operations.Is there a better
> solution?
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