dongjoon-hyun commented on a change in pull request #24385: [SPARK-27480][SQL]
Improve explain output of describe query command to show the actual input query
as opposed to a truncated logical plan.
URL: https://github.com/apache/spark/pull/24385#discussion_r276423031
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala
##########
@@ -373,7 +374,11 @@ class SparkSqlAstBuilder(conf: SQLConf) extends
AstBuilder(conf) {
* Create a [[DescribeQueryCommand]] logical command.
*/
override def visitDescribeQuery(ctx: DescribeQueryContext): LogicalPlan =
withOrigin(ctx) {
- DescribeQueryCommand(visitQuery(ctx.query))
+ val query = ctx.query
+ val startIndex = query.start.getStartIndex
+ val endIndex = query.stop.getStopIndex
+ val interval = new Interval(startIndex, endIndex)
+ DescribeQueryCommand(query.start.getInputStream.getText(interval),
visitQuery(ctx.query))
Review comment:
@dilipbiswal . For consistency, could you improve `DescribeTableCommand` at
least? For example, it will be useful for the following case.
```scala
spark-sql> EXPLAIN DESCRIBE TABLE t1;
== Physical Plan ==
*(1) Scan OneRowRelation[]
spark-sql> EXPLAIN DESCRIBE QUERY SELECT 1;
== Physical Plan ==
Execute DescribeQueryCommand
+- DescribeQueryCommand SELECT 1
```
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