Fixed overflow in VA. column offset was char, changed it to int as th…

…ere can be many columns with svm light.

src/main/java/water/ValueArray.java

@@ -211,7 +211,7 @@ static public class Column extends Iced implements Cloneable {
     public long _n;
     public int  _base;  // Base
     public char _scale; // Actual value is (((double)(stored_value+base))/scale); 1,10,100,1000
-    public char _off;   // Offset within a row
+    public int _off;   // Offset within a row
     public byte _size;  // Size is 1,2,4 or 8 bytes, or -4,-8 for float/double data
 
     public Column() { _min = Double.MAX_VALUE; _max = -Double.MAX_VALUE; _scale = 1; }

src/main/java/water/parser/DParseTask.java

@@ -445,7 +445,7 @@ protected void createValueArrayHeader() {
       cols[i]._base = _bases[i];
       assert (char)pow10i(-_scale[i]) == pow10i(-_scale[i]):"scale out of bounds!, col = " + i + ", scale = " + _scale[i];
       cols[i]._scale = (char)pow10i(-_scale[i]);
-      cols[i]._off = (char)off;
+      cols[i]._off = off;
       cols[i]._size = (byte)COL_SIZES[_colTypes[i]];
       cols[i]._domain = _colDomains[i];
       cols[i]._max = _max[i];