Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16422#discussion_r122347812
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala ---
@@ -306,10 +306,15 @@ class SparkSqlAstBuilder(conf: SQLConf) extends
AstBuilder(conf) {
* 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 {
+ DescribeColumnCommand(
+ visitTableIdentifier(ctx.tableIdentifier),
+ ctx.describeColName.getText,
--- End diff --
the column name syntax is:
```
describeColName
: identifier ('.' (identifier | STRING))*
;
```
since we will always have a table name before column name, do we really
need to support qualified column name here?
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