code: func VectorizedExecute(ctx sessionctx.Context, exprs []Expression, iterator *chunk.Iterator4Chunk, output *chunk.Chunk) error {
  	for colID, expr := range exprs {
  		err := evalOneColumn(ctx, expr, iterator, output, colID)
  		if err != nil {
  			return err
  		}
  	}
  	return nil
  }
docs: // VectorizedExecute evaluates a list of expressions column by column and append their results to "output" Chunk.