imback82 commented on a change in pull request #26006: [SPARK-29279][SQL] Merge
SHOW NAMESPACES and SHOW DATABASES code path
URL: https://github.com/apache/spark/pull/26006#discussion_r331732193
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File path: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
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@@ -2694,7 +2694,7 @@ class SQLQuerySuite extends QueryTest with
SharedSparkSession {
sparkContext.addSparkListener(listener)
try {
// Execute the command.
- sql("show databases").head()
+ sql("EXPLAIN show databases").head()
Review comment:
This is because the new `*Exec` classes extends `LeafExecNode`, which runs a
job when `executeCollect` is called. If we need to keep the behavior same
(#17027), we can reuse `ExecutedCommandExec` along with `RunnableCommand` or
introduce new physical operator for these commands that don't require running a
job. @cloud-fan, looks like you reviewed #17027 back in 2017. :) This is still
a hard requirement right?
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