Can it do column mapping?

[poppy0708]

Hi,

Can I achieve column mapping through this parser?
Known it can analysis the columns that was referenced by a query, while how about the column mapping relationship to the result set column.
For example, there is a query:
T |project col1, col2, col3 |summarize arg1 = max(col1) by col2, col3 |project arg1, arg2 = col2, arg3 =col3
Can it infer the information that arg1 origin from col1, arg2 from col2, arg3 from col3?

Thank you!

[poppy0708]

I also found that only of the column name is explicitly called out, it is returned in GetDatabaseTableColumns result.
If I use "project-away col1", I expect all other columns return besides col1, while it returns null.
If I use "project-reorder", I expect all columns are returned, while it returns null.

Is this a bug?

[Matt Warren]

The GetDatabaseTableColumns function only returns columns that are explicitly referenced in the query. If you want to know the set of columns returned by the query you can examine the KustoCode.ResultType property. It should contain a TableSymbol with all the columns.

[poppy0708]

Thanks for your confirmation, Matt