Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18958#discussion_r134779475
  
    --- Diff: 
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/ColumnarBatch.java
 ---
    @@ -307,64 +306,69 @@ public void update(int ordinal, Object value) {
     
         @Override
         public void setNullAt(int ordinal) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNull(rowId);
    +      getColumnAsWritable(ordinal).putNull(rowId);
         }
     
         @Override
         public void setBoolean(int ordinal, boolean value) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNotNull(rowId);
    -      columns[ordinal].putBoolean(rowId, value);
    +      WritableColumnVector column = getColumnAsWritable(ordinal);
    +      column.putNotNull(rowId);
    +      column.putBoolean(rowId, value);
         }
     
         @Override
         public void setByte(int ordinal, byte value) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNotNull(rowId);
    -      columns[ordinal].putByte(rowId, value);
    +      WritableColumnVector column = getColumnAsWritable(ordinal);
    +      column.putNotNull(rowId);
    +      column.putByte(rowId, value);
         }
     
         @Override
         public void setShort(int ordinal, short value) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNotNull(rowId);
    -      columns[ordinal].putShort(rowId, value);
    +      WritableColumnVector column = getColumnAsWritable(ordinal);
    +      column.putNotNull(rowId);
    +      column.putShort(rowId, value);
         }
     
         @Override
         public void setInt(int ordinal, int value) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNotNull(rowId);
    -      columns[ordinal].putInt(rowId, value);
    +      WritableColumnVector column = getColumnAsWritable(ordinal);
    +      column.putNotNull(rowId);
    +      column.putInt(rowId, value);
         }
     
         @Override
         public void setLong(int ordinal, long value) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNotNull(rowId);
    -      columns[ordinal].putLong(rowId, value);
    +      WritableColumnVector column = getColumnAsWritable(ordinal);
    +      column.putNotNull(rowId);
    +      column.putLong(rowId, value);
         }
     
         @Override
         public void setFloat(int ordinal, float value) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNotNull(rowId);
    -      columns[ordinal].putFloat(rowId, value);
    +      WritableColumnVector column = getColumnAsWritable(ordinal);
    +      column.putNotNull(rowId);
    +      column.putFloat(rowId, value);
         }
     
         @Override
         public void setDouble(int ordinal, double value) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNotNull(rowId);
    -      columns[ordinal].putDouble(rowId, value);
    +      WritableColumnVector column = getColumnAsWritable(ordinal);
    +      column.putNotNull(rowId);
    +      column.putDouble(rowId, value);
         }
     
         @Override
         public void setDecimal(int ordinal, Decimal value, int precision) {
    -      assert (!columns[ordinal].isConstant);
    -      columns[ordinal].putNotNull(rowId);
    -      columns[ordinal].putDecimal(rowId, value, precision);
    +      WritableColumnVector column = getColumnAsWritable(ordinal);
    +      column.putNotNull(rowId);
    +      column.putDecimal(rowId, value, precision);
    +    }
    +
    +    private WritableColumnVector getColumnAsWritable(int ordinal) {
    --- End diff --
    
    nit: `getWritableColumn`


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