hsyuan commented on a change in pull request #1991:
URL: https://github.com/apache/calcite/pull/1991#discussion_r433405786
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File path:
core/src/main/java/org/apache/calcite/config/CalciteConnectionProperty.java
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@@ -105,6 +105,10 @@
* {@link org.apache.calcite.sql.parser.SqlParserImplFactory}. */
PARSER_FACTORY("parserFactory", Type.PLUGIN, null, false),
+ /** Specifies whether to use top down optimization.
+ * {@link
org.apache.calcite.plan.volcano.VolcanoPlanner#setTopDownOpt(boolean)} */
+ TOP_DOWN_OPT("topDownOpt", Type.BOOLEAN, true, false),
Review comment:
To be prepared for the top-down rule apply. With top-down rule apply,
the original code path will be different. And there will be more plan diff
combining with project/filter/join's trait propagation.
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