[SQL] SPARK-1661 - Fix regex_serde test

The JIRA in question is actually reporting a bug with Shark, but I wanted to make sure Spark SQL did not have similar problems.  This fixes a bug in our parsing code that was preventing the test from executing, but it looks like the RegexSerDe is working in Spark SQL.

Author: Michael Armbrust <michael@databricks.com>

Closes #595 from marmbrus/fixRegexSerdeTest and squashes the following commits:

a4dc612 [Michael Armbrust] Add files created by hive to gitignore.
efa6402 [Michael Armbrust] Fix Hive serde_regex test.

.gitignore

@@ -49,3 +49,8 @@ unit-tests.log
 /lib/
 rat-results.txt
 scalastyle.txt
+
+# For Hive
+metastore_db/
+metastore/
+warehouse/

sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala

@@ -347,7 +347,11 @@ private[hive] object HiveQl {
   protected def nodeToPlan(node: Node): LogicalPlan = node match {
     // Just fake explain for any of the native commands.
     case Token("TOK_EXPLAIN", explainArgs) if nativeCommands contains explainArgs.head.getText =>
-      NoRelation
+      ExplainCommand(NoRelation)
+    // Create tables aren't native commands due to CTAS queries, but we still don't need to
+    // explain them.
+    case Token("TOK_EXPLAIN", explainArgs) if explainArgs.head.getText == "TOK_CREATETABLE" =>
+      ExplainCommand(NoRelation)
     case Token("TOK_EXPLAIN", explainArgs) =>
       // Ignore FORMATTED if present.
       val Some(query) :: _ :: _ :: Nil =

sql/hive/src/test/resources/golden/serde_regex-0-60462d14b99bb445b02800e9fb22760e

@@ -0,0 +1,22 @@
+ABSTRACT SYNTAX TREE:
+  (TOK_CREATETABLE (TOK_TABNAME serde_regex) TOK_LIKETABLE (TOK_TABCOLLIST (TOK_TABCOL host TOK_STRING) (TOK_TABCOL identity TOK_STRING) (TOK_TABCOL user TOK_STRING) (TOK_TABCOL time TOK_STRING) (TOK_TABCOL request TOK_STRING) (TOK_TABCOL status TOK_STRING) (TOK_TABCOL size TOK_INT) (TOK_TABCOL referer TOK_STRING) (TOK_TABCOL agent TOK_STRING)) (TOK_TABLESERIALIZER (TOK_SERDENAME 'org.apache.hadoop.hive.serde2.RegexSerDe' (TOK_TABLEPROPERTIES (TOK_TABLEPROPLIST (TOK_TABLEPROPERTY "input.regex" "([^ ]*) ([^ ]*) ([^ ]*) (-|\\[[^\\]]*\\]) ([^ \"]*|\"[^\"]*\") (-|[0-9]*) (-|[0-9]*)(?: ([^ \"]*|\"[^\"]*\") ([^ \"]*|\"[^\"]*\"))?"))))) TOK_TBLTEXTFILE)
+
+STAGE DEPENDENCIES:
+  Stage-0 is a root stage
+
+STAGE PLANS:
+  Stage: Stage-0
+      Create Table Operator:
+        Create Table
+          columns: host string, identity string, user string, time string, request string, status string, size int, referer string, agent string
+          if not exists: false
+          input format: org.apache.hadoop.mapred.TextInputFormat
+          # buckets: -1
+          output format: org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat
+          serde name: org.apache.hadoop.hive.serde2.RegexSerDe
+          serde properties:
+            input.regex ([^ ]*) ([^ ]*) ([^ ]*) (-|\[[^\]]*\]) ([^ "]*|"[^"]*") (-|[0-9]*) (-|[0-9]*)(?: ([^ "]*|"[^"]*") ([^ "]*|"[^"]*"))?
+          name: serde_regex
+          isExternal: false
+
+

sql/hive/src/test/resources/golden/serde_regex-10-c5b3ec90419a40660e5f83736241c429

@@ -0,0 +1,38 @@
+NULL	0
+NULL	0
+-1234567890.123456789	-1234567890
+-4400	4400
+-1255.49	-1255
+-1.122	-11
+-1.12	-1
+-1.12	-1
+-0.333	0
+-0.33	0
+-0.3	0
+0	0
+0	0
+0.01	0
+0.02	0
+0.1	0
+0.2	0
+0.3	0
+0.33	0
+0.333	0
+0.9999999999999999999999999	1
+1	1
+1	1
+1.12	1
+1.122	1
+2	2
+2	2
+3.14	3
+3.14	3
+3.14	3
+3.14	4
+10	10
+20	20
+100	100
+124	124
+125.2	125
+200	200
+1234567890.12345678	1234567890

sql/hive/src/test/resources/golden/serde_regex-4-c3e345183543f40a14d2dd742ebd5346

@@ -0,0 +1,2 @@
+127.0.0.1	-	frank	[10/Oct/2000:13:55:36 -0700]	"GET /apache_pb.gif HTTP/1.0"	200	2326	NULL	NULL
+127.0.0.1	-	-	[26/May/2009:00:00:00 +0000]	"GET /someurl/?track=Blabla(Main) HTTP/1.1"	200	5864	-	"Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/525.19 (KHTML, like Gecko) Chrome/1.0.154.65 Safari/525.19"

sql/hive/src/test/resources/golden/serde_regex-5-e2d14a76a87a6014c6d2d3501a0c9129

@@ -0,0 +1,2 @@
+127.0.0.1	2326	200	[10/Oct/2000:13:55:36 -0700]
+127.0.0.1	5864	200	[26/May/2009:00:00:00 +0000]

sql/hive/src/test/resources/golden/serde_regex-7-4db287576a17c0963219ca63ee0b20e0

@@ -0,0 +1,22 @@
+ABSTRACT SYNTAX TREE:
+  (TOK_CREATETABLE (TOK_TABNAME serde_regex1) TOK_LIKETABLE (TOK_TABCOLLIST (TOK_TABCOL key TOK_DECIMAL) (TOK_TABCOL value TOK_INT)) (TOK_TABLESERIALIZER (TOK_SERDENAME 'org.apache.hadoop.hive.serde2.RegexSerDe' (TOK_TABLEPROPERTIES (TOK_TABLEPROPLIST (TOK_TABLEPROPERTY "input.regex" "([^ ]*) ([^ ]*)"))))) TOK_TBLTEXTFILE)
+
+STAGE DEPENDENCIES:
+  Stage-0 is a root stage
+
+STAGE PLANS:
+  Stage: Stage-0
+      Create Table Operator:
+        Create Table
+          columns: key decimal, value int
+          if not exists: false
+          input format: org.apache.hadoop.mapred.TextInputFormat
+          # buckets: -1
+          output format: org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat
+          serde name: org.apache.hadoop.hive.serde2.RegexSerDe
+          serde properties:
+            input.regex ([^ ]*) ([^ ]*)
+          name: serde_regex1
+          isExternal: false
+
+

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveCompatibilitySuite.scala

@@ -568,6 +568,7 @@ class HiveCompatibilitySuite extends HiveQueryFileTest with BeforeAndAfter {
     "select_unquote_and",
     "select_unquote_not",
     "select_unquote_or",
+    "serde_regex",
     "serde_reported_schema",
     "set_variable_sub",
     "show_describe_func_quotes",