func buildColIndex(sourceConn datasource.SourceConn, from *expr.SqlSource) error {
if from.Source == nil {
return nil
}
colSchema, ok := sourceConn.(datasource.SchemaColumns)
if !ok {
u.Errorf("Could not create column Schema for %v %T %#v", from.Name, sourceConn, sourceConn)
return fmt.Errorf("Must Implement SchemaColumns")
}
from.BuildColIndex(colSchema.Columns())
return nil
}
