change date to int, good for performance (apache#10889)

tools/ssb-tools/ddl/create-ssb-flat-table.sql

@@ -16,7 +16,7 @@
 -- under the License.
 
 CREATE TABLE `lineorder_flat` (
-  `LO_ORDERDATE` date NOT NULL COMMENT "",
+  `LO_ORDERDATE` int(11) NOT NULL COMMENT "",
   `LO_ORDERKEY` int(11) NOT NULL COMMENT "",
   `LO_LINENUMBER` tinyint(4) NOT NULL COMMENT "",
   `LO_CUSTKEY` int(11) NOT NULL COMMENT "",
@@ -58,13 +58,13 @@ CREATE TABLE `lineorder_flat` (
 DUPLICATE KEY(`LO_ORDERDATE`, `LO_ORDERKEY`)
 COMMENT "OLAP"
 PARTITION BY RANGE(`LO_ORDERDATE`)
-(PARTITION p1 VALUES [('0000-01-01'), ('1993-01-01')),
-PARTITION p2 VALUES [('1993-01-01'), ('1994-01-01')),
-PARTITION p3 VALUES [('1994-01-01'), ('1995-01-01')),
-PARTITION p4 VALUES [('1995-01-01'), ('1996-01-01')),
-PARTITION p5 VALUES [('1996-01-01'), ('1997-01-01')),
-PARTITION p6 VALUES [('1997-01-01'), ('1998-01-01')),
-PARTITION p7 VALUES [('1998-01-01'), ('1999-01-01')))
+(PARTITION p1992 VALUES [("-2147483648"), ("19930101")),
+PARTITION p1993 VALUES [("19930101"), ("19940101")),
+PARTITION p1994 VALUES [("19940101"), ("19950101")),
+PARTITION p1995 VALUES [("19950101"), ("19960101")),
+PARTITION p1996 VALUES [("19960101"), ("19970101")),
+PARTITION p1997 VALUES [("19970101"), ("19980101")),
+PARTITION p1998 VALUES [("19980101"), ("19990101")))
 DISTRIBUTED BY HASH(`LO_ORDERKEY`) BUCKETS 48
 PROPERTIES (
 "replication_num" = "1",