func (e *havingAndOrderbyResolver) addProjectionExpr(v *ast.ColumnNameExpr, projCol *expression.Column) {
// Avoid to append same column repeatly.
for i, expr := range e.proj.Exprs {
if expr == projCol {
e.mapper[v] = e.proj.schema[i]
return
}
}
e.proj.Exprs = append(e.proj.Exprs, projCol)
schemaCols, _ := projCol.DeepCopy().(*expression.Column)
e.mapper[v] = schemaCols
e.proj.schema = append(e.proj.schema, schemaCols)
}
func (e *havingAndOrderbyResolver) addProjectionExpr(v *ast.ColumnNameExpr, projCol *expression.Column) {
e.proj.Exprs = append(e.proj.Exprs, projCol)
schemaCols, _ := projCol.DeepCopy().(*expression.Column)
e.mapper[v] = schemaCols
e.proj.schema = append(e.proj.schema, schemaCols)
}