Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/16422#discussion_r125805788
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala ---
@@ -320,10 +320,15 @@ 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,
+ ctx.FORMATTED != null)
--- End diff --
I just tested in hive 2.1, it only show detailed column info with
`formatted`, shall we keep the same as hive?
```
hive> desc test key;
OK
key int from deserializer
Time taken: 0.063 seconds, Fetched: 1 row(s)
hive> desc extended test key;
OK
key int from deserializer
Time taken: 0.053 seconds, Fetched: 1 row(s)
hive> desc formatted test key;
OK
# col_name data_type min
max num_nulls distinct_count
avg_col_len max_col_len num_trues
num_falses comment
key int 1
2 0 2
from deserializer
Time taken: 0.067 seconds, Fetched: 3 row(s)
```
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