Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16422#discussion_r94267919
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala ---
@@ -300,10 +300,21 @@ class SparkSqlAstBuilder(conf: SQLConf) extends
AstBuilder {
* Create a [[DescribeTableCommand]] logical plan.
*/
override def visitDescribeTable(ctx: DescribeTableContext): LogicalPlan
= withOrigin(ctx) {
- // Describe column are not supported yet. Return null and let the
parser decide
- // what to do with this (create an exception or pass it on to a
different system).
if (ctx.describeColName != null) {
- null
+ if (ctx.partitionSpec != null) {
+ throw new ParseException("DESC TABLE COLUMN for a specific
partition is not supported", ctx)
+ } else {
+ val columnName = ctx.describeColName.getText
+ if (columnName.contains(".")) {
+ throw new ParseException(
+ "DESC TABLE COLUMN for an inner column of a nested type is not
supported", ctx)
--- End diff --
This might generate a confusing error message.
```
sql("describe formatted default.tab1.s").show(false)
org.apache.spark.sql.catalyst.parser.ParseException:
DESC TABLE COLUMN for an inner column of a nested type is not
supported(line 1, pos 0)
```
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