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[SPARK-54008] Skip QO for DESCRIBE QUERY #52713

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[SPARK-54008] Skip QO for DESCRIBE QUERY #52713

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4 changes: 3 additions & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@ import org.apache.spark.sql.catalyst.util.ResolveDefaultColumns.CURRENT_DEFAULT_
import org.apache.spark.sql.classic.ClassicConversions.castToImpl
import org.apache.spark.sql.connector.catalog.CatalogV2Implicits.TableIdentifierHelper
import org.apache.spark.sql.errors.{QueryCompilationErrors, QueryExecutionErrors}
import org.apache.spark.sql.execution.CommandExecutionMode
import org.apache.spark.sql.execution.datasources.DataSource
import org.apache.spark.sql.execution.datasources.csv.CSVFileFormat
import org.apache.spark.sql.execution.datasources.json.JsonFileFormat
Expand Down Expand Up @@ -773,7 +774,8 @@ case class DescribeQueryCommand(queryText: String, plan: LogicalPlan)

override def run(sparkSession: SparkSession): Seq[Row] = {
val result = new ArrayBuffer[Row]
val queryExecution = sparkSession.sessionState.executePlan(plan)
// DESCRIBE QUERY only needs the schema, so we can skip execution.
val queryExecution = sparkSession.sessionState.executePlan(plan, CommandExecutionMode.SKIP)
describeSchema(queryExecution.analyzed.schema, result, header = false)
result.toSeq
}
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