ShreelekhyaG commented on a change in pull request #4113:
URL: https://github.com/apache/carbondata/pull/4113#discussion_r613799287
##########
File path:
integration/spark/src/main/scala/org/apache/spark/sql/execution/command/table/CarbonDescribeFormattedCommand.scala
##########
@@ -370,3 +374,147 @@ private[sql] case class CarbonDescribeFormattedCommand(
override protected def opName: String = "DESC FORMATTED"
}
+
+case class CarbonDescribeColumnCommand(
+ databaseNameOp: Option[String],
+ tableName: String,
+ inputFieldNames: java.util.List[String])
+ extends MetadataCommand {
+
+ override val output: Seq[Attribute] = Seq(
+ // Column names are based on Hive.
+ AttributeReference("col_name", StringType, nullable = false,
+ new MetadataBuilder().putString("comment", "name of the
column").build())(),
+ AttributeReference("data_type", StringType, nullable = false,
+ new MetadataBuilder().putString("comment", "data type of the
column").build())(),
+ AttributeReference("comment", StringType, nullable = true,
+ new MetadataBuilder().putString("comment", "comment of the
column").build())()
+ )
+
+ override def processMetadata(sparkSession: SparkSession): Seq[Row] = {
+ val (tableSchema, carbonTable) = Checker.getSchemaAndTable(databaseNameOp,
tableName)
Review comment:
Done
##########
File path: docs/ddl-of-carbondata.md
##########
@@ -646,6 +647,68 @@ CarbonData DDL statements are documented here,which
includes:
## TABLE MANAGEMENT
+### DESCRIBE COMMAND
+
+Describe column of table and visualize its structure with child fields.
Review comment:
Done
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