dilipbiswal commented on a change in pull request #24385: [SPARK-27480][SQL]
Improve `EXPLAIN DESC QUERY` to show the input SQL statement
URL: https://github.com/apache/spark/pull/24385#discussion_r277099053
##########
File path: sql/core/src/test/resources/sql-tests/results/describe-query.sql.out
##########
@@ -154,16 +154,46 @@ DESCRIBE
-- !query 15
-DROP TABLE desc_temp1
+EXPLAIN DESC QUERY SELECT * FROM desc_temp2 WHERE key > 0
-- !query 15 schema
-struct<>
+struct<plan:string>
-- !query 15 output
-
+== Physical Plan ==
+Execute DescribeQueryCommand
+ +- DescribeQueryCommand SELECT * FROM desc_temp2 WHERE key > 0
-- !query 16
-DROP TABLE desc_temp2
+EXPLAIN EXTENDED DESC WITH s AS (SELECT 'hello' as col1) SELECT * FROM s
-- !query 16 schema
-struct<>
+struct<plan:string>
-- !query 16 output
+== Parsed Logical Plan ==
+DescribeQueryCommand WITH s AS (SELECT 'hello' as col1) SELECT * FROM s
+
+== Analyzed Logical Plan ==
+col_name: string, data_type: string, comment: string
+DescribeQueryCommand WITH s AS (SELECT 'hello' as col1) SELECT * FROM s
+
+== Optimized Logical Plan ==
+DescribeQueryCommand WITH s AS (SELECT 'hello' as col1) SELECT * FROM s
+
+== Physical Plan ==
+Execute DescribeQueryCommand
+ +- DescribeQueryCommand WITH s AS (SELECT 'hello' as col1) SELECT * FROM s
Review comment:
@dongjoon-hyun I thought about this some more. Actually i think there is an
ambiguity whether the "surrounding" comments are part of the explain statement
or the query. In order to verify the theory, i tried the following :
```
create view vtest as /* leading */ select /* embeded */ 1 FROM VALUES(1) /*
trailing */;
spark-sql> show table extended like 'vtest';
default vtest false Database: default
Table: vtest
Owner: dbiswal
Created Time: Fri Apr 19 14:36:32 PDT 2019
Last Access: Wed Dec 31 16:00:00 PST 1969
Created By: Spark 3.0.0-SNAPSHOT
Type: VIEW
View Text: select /* embeded */ 1 FROM VALUES(1)
View Original Text: select /* embeded */ 1 FROM VALUES(1)
View Default Database: default
View Query Output Columns: [1]
Table Properties: [transient_lastDdlTime=1555709792, view.query.out.col.0=1,
view.query.out.numCols=1, view.default.database=default]
Serde Library: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
InputFormat: org.apache.hadoop.mapred.SequenceFileInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
Storage Properties: [serialization.format=1]
Schema: root
|-- 1: integer (nullable = false)
```
As we see here the original query does not contain the surrounding comments.
Given this, i think we would be okay in dropping the surrounding comments and
preserving the embedded comments. What do you think ?
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