[SPARK-13924][SQL] officially support multi-insert

## What changes were proposed in this pull request?

There is a feature of hive SQL called multi-insert. For example:
```
FROM src
INSERT OVERWRITE TABLE dest1
SELECT key + 1
INSERT OVERWRITE TABLE dest2
SELECT key WHERE key > 2
INSERT OVERWRITE TABLE dest3
SELECT col EXPLODE(arr) exp AS col
...
```

We partially support it currently, with some limitations: 1) WHERE can't reference columns produced by LATERAL VIEW. 2) It's not executed eagerly, i.e. `sql("...multi-insert clause...")` won't take place right away like other commands, e.g. CREATE TABLE.

This PR removes these limitations and make us fully support multi-insert.

## How was this patch tested?

new tests in `SQLQuerySuite`

Author: Wenchen Fan <wenchen@databricks.com>

Closes #11754 from cloud-fan/lateral-view.

1 files changed, 11 insertions, 11 deletions

diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/CatalystQl.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/CatalystQl.scala
index b1b449a0b3..7d5a46873c 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/CatalystQl.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/CatalystQl.scala
@@ -204,20 +204,20 @@ https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C
             case None => OneRowRelation
           }
 
+          val withLateralView = lateralViewClause.map { lv =>
+            nodeToGenerate(lv.children.head, outer = false, relations)
+          }.getOrElse(relations)
+
           val withWhere = whereClause.map { whereNode =>
             val Seq(whereExpr) = whereNode.children
-            Filter(nodeToExpr(whereExpr), relations)
-          }.getOrElse(relations)
+            Filter(nodeToExpr(whereExpr), withLateralView)
+          }.getOrElse(withLateralView)
 
           val select = (selectClause orElse selectDistinctClause)
             .getOrElse(sys.error("No select clause."))
 
           val transformation = nodeToTransformation(select.children.head, withWhere)
 
-          val withLateralView = lateralViewClause.map { lv =>
-            nodeToGenerate(lv.children.head, outer = false, withWhere)
-          }.getOrElse(withWhere)
-
           // The projection of the query can either be a normal projection, an aggregation
           // (if there is a group by) or a script transformation.
           val withProject: LogicalPlan = transformation.getOrElse {
@@ -227,13 +227,13 @@ https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C
               groupByClause.map(e => e match {
                 case Token("TOK_GROUPBY", children) =>
                   // Not a transformation so must be either project or aggregation.
-                  Aggregate(children.map(nodeToExpr), selectExpressions, withLateralView)
+                  Aggregate(children.map(nodeToExpr), selectExpressions, withWhere)
                 case _ => sys.error("Expect GROUP BY")
               }),
               groupingSetsClause.map(e => e match {
                 case Token("TOK_GROUPING_SETS", children) =>
                   val(groupByExprs, masks) = extractGroupingSet(children)
-                  GroupingSets(masks, groupByExprs, withLateralView, selectExpressions)
+                  GroupingSets(masks, groupByExprs, withWhere, selectExpressions)
                 case _ => sys.error("Expect GROUPING SETS")
               }),
               rollupGroupByClause.map(e => e match {
@@ -241,7 +241,7 @@ https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C
                   Aggregate(
                     Seq(Rollup(children.map(nodeToExpr))),
                     selectExpressions,
-                    withLateralView)
+                    withWhere)
                 case _ => sys.error("Expect WITH ROLLUP")
               }),
               cubeGroupByClause.map(e => e match {
@@ -249,10 +249,10 @@ https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C
                   Aggregate(
                     Seq(Cube(children.map(nodeToExpr))),
                     selectExpressions,
-                    withLateralView)
+                    withWhere)
                 case _ => sys.error("Expect WITH CUBE")
               }),
-              Some(Project(selectExpressions, withLateralView))).flatten.head
+              Some(Project(selectExpressions, withWhere))).flatten.head
           }
 
           // Handle HAVING clause.