Hmm, the getColumnOrigins only gives you output columns, not the used columns.
You can follow the example of ColumnOrigins, but for the Join operator, should
also process the join conditions.
For Filter operator, need to process the filter condition.
On 2020/06/04 10:24:55, Gaurav Sehgal wrote:
Hi Haisheng,
Thanks for replying so quickly.
I'm able to find all the columns used in Project expression
using RelMetadataQuery.getColumnOrigins, but not sure how to go about other
expressions like join, and filter.
Example:
with t as (select test.colb from test left join test2 on test2.colb =
Hi Gaurav,
You may find this useful:
https://lists.apache.org/thread.html/rc38d12de860f64e8e2926b7bcf6f2e9e6bcbfbc7ca5e886a71323b47%40%3Cdev.calcite.apache.org%3E
On 2020/06/04 01:41:41, Gaurav Sehgal wrote:
> Hi,
>
> I've a use case where i want to find all the columns, and their respective
>
Hi,
I've a use case where i want to find all the columns, and their respective
tables accessed in a sql query. I'm able to find all the table names by
converting the sql query to RelNode and then visiting the TableScan node
but not sure what would be the right approach to find all the column names
