dilipbiswal commented on a change in pull request #24759: [SPARK-27395][SQL] 
Improve EXPLAIN command
URL: https://github.com/apache/spark/pull/24759#discussion_r316486771
 
 

 ##########
 File path: sql/core/src/test/resources/sql-tests/inputs/explain.sql
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 @@ -0,0 +1,97 @@
+-- Test tables
+CREATE table  explain_temp1 (key int, val int) USING PARQUET;
+CREATE table  explain_temp2 (key int, val int) USING PARQUET;
+CREATE table  explain_temp3 (key int, val int) USING PARQUET;
+
+-- Simple explain
+SET spark.sql.codegen.wholeStage = true;
+
+-- single table
+EXPLAIN FORMATTED
+  SELECT key, max(val) 
+  FROM   explain_temp1 
+  WHERE  key > 0 
+  GROUP  BY key 
+  ORDER  BY key; 
+
+EXPLAIN FORMATTED
+  SELECT key, max(val)
+  FROM explain_temp1
+  WHERE key > 0
+  GROUP BY key
+  HAVING max(val) > 0;
+
+-- simple union
+EXPLAIN FORMATTED
+  SELECT key, val FROM explain_temp1 WHERE key > 0
+  UNION 
+  SELECT key, val FROM explain_temp1 WHERE key > 0;
+
+-- Join
+EXPLAIN FORMATTED
+  SELECT * 
+  FROM   explain_temp1 a, 
+         explain_temp2 b 
+  WHERE  a.key = b.key; 
+
+EXPLAIN FORMATTED
+  SELECT * 
+  FROM   explain_temp1 a 
+         INNER JOIN explain_temp2 b 
+                 ON a.key = b.key; 
+EXPLAIN FORMATTED
 
 Review comment:
   @cloud-fan OK.
   

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