Merge branch 'revert-0e23e50c' into '1.5_v3.6.0'

Revert "Merge branch '1.5_3.6.0_bigunsigned' into '1.5_v3.6.0'"

This reverts merge request !44

See merge request !45

Author: zoudaokoulife

rdb/rdb-side/src/main/java/com/dtstack/flink/sql/side/rdb/util/MathUtil.java

@@ -48,8 +48,6 @@ public static Long getLongVal(Object obj) {
             return Long.valueOf(obj.toString());
         } else if (obj instanceof BigDecimal) {
             return ((BigDecimal) obj).longValue();
-        } else if (obj instanceof BigInteger) {
-            return ((BigInteger) obj).longValue();
         }
 
         throw new RuntimeException("not support type of " + obj.getClass() + " convert to Long.");

rdb/rdb-side/src/main/java/com/dtstack/flink/sql/side/rdb/util/SwitchUtil.java

@@ -42,7 +42,6 @@ public static Object getTarget(Object obj, String targetType) {
                 return MathUtil.getIntegerVal(obj);
 
             case "bigint":
-            case "bigintunsigned":
             case "intunsigned":
             case "integerunsigned":
                 return MathUtil.getLongVal(obj);