AJ-706: support decimal vector combine method;

Author: chengyitian

src/com/xxdb/data/BasicDecimal128Vector.java

@@ -231,7 +231,15 @@ public void setExtraParamForType(int scale){
 
     @Override
     public Vector combine(Vector vector) {
-        throw new RuntimeException("BasicDecimal128Vector not support combine yet!");
+        BasicDecimal128Vector v = (BasicDecimal128Vector)vector;
+        if (v.getScale() != this.scale_)
+            throw new RuntimeException("The scale of the vector to be combine does not match the scale of the current vector.");
+        int newSize = this.rows() + v.rows();
+        BigInteger[] newValue = new BigInteger[newSize];
+        System.arraycopy(this.unscaledValues,0, newValue,0,this.rows());
+        System.arraycopy(v.unscaledValues,0, newValue,this.rows(),v.rows());
+
+        return new BasicDecimal128Vector(newValue, this.scale_);
     }
 
     @Override

src/com/xxdb/data/BasicDecimal32Vector.java

@@ -151,7 +151,15 @@ protected void writeVectorToOutputStream(ExtendedDataOutput out) throws IOExcept
 
     @Override
     public Vector combine(Vector vector) {
-        return null;
+        BasicDecimal32Vector v = (BasicDecimal32Vector)vector;
+        if (v.getScale() != this.scale_)
+            throw new RuntimeException("The scale of the vector to be combine does not match the scale of the current vector.");
+        int newSize = this.rows() + v.rows();
+        int[] newValue = new int[newSize];
+        System.arraycopy(this.unscaledValues,0, newValue,0,this.rows());
+        System.arraycopy(v.unscaledValues,0, newValue,this.rows(),v.rows());
+
+        return new BasicDecimal32Vector(newValue, this.scale_);
     }
 
     @Override

src/com/xxdb/data/BasicDecimal64Vector.java

@@ -159,7 +159,15 @@ public void setExtraParamForType(int scale){
 
     @Override
     public Vector combine(Vector vector) {
-        return null;
+        BasicDecimal64Vector v = (BasicDecimal64Vector)vector;
+        if (v.getScale() != this.scale_)
+            throw new RuntimeException("The scale of the vector to be combine does not match the scale of the current vector.");
+        int newSize = this.rows() + v.rows();
+        long[] newValue = new long[newSize];
+        System.arraycopy(this.unscaledValues,0, newValue,0,this.rows());
+        System.arraycopy(v.unscaledValues,0, newValue,this.rows(),v.rows());
+
+        return new BasicDecimal64Vector(newValue, this.scale_);
     }
 
     @Override