Hi benchao, I want to fix the bug, can I log a jira issue? On Sat, 20 Aug 2022 at 11:13, Benchao Li <libenc...@apache.org> wrote:
> Pranav, > > This is a good question. To me, I would take this as a bug, and we could > improve the > RelToSqlConverter to treat BindableTableScan specially. > Could you please help log a Jira issue? Contributions are welcome! > > Pranav Deshpande <deshpande.v.pra...@gmail.com> 于2022年8月20日周六 02:13写道： > > > Hi Team, > > How can I convert a BindableTableScan with projects and Filters back to a > > RelTree with a project node, a filter node and a tablescan node? > > > > I am doing this because I encountered the following issue (steps detailed > > below). > > > > 1. I have a query:eg. Select colA, colB from myTable where colA > 1; > > 2. The logical plan for this is a filter on top of a project on top of a > > TableScan. > > 3. If the table we created is a ProjectableFilterableTable and we have > > added the ProjectTableScan rule etc., then after optimization we have a > > single node which is a tablescan that contains filters and project and > can > > be executed by the bindable convention. > > 4. If I convert this node to a SQL, I get the wrong SQL. > > > > To get a SQL, I do the following: > > > > RelToSqlConverter converter = new > > RelToSqlConverter(SqlDialect.DatabaseProduct.CALCITE.getDialect()); > > SqlNode sqlNode = converter.visitRoot(rablescan).asStatement(); > > > > This only gives me Select * from myTable; > > > > However, if I only have a ScannableTable and we haven't added the > > ProjectTableScan rule etc. then for the physical plan we also get a > > BindableFilter on top of a BindableProject on top of a BindableTablescan. > > > > If i convert this back using the same code then I get the correct > statement > > back: Select colA, colB from myTable where colA > 1 > > > > Hence I would like to know how to convert a BindableTableScan with > projects > > and Filters back to a RelTree with a project node, a filter node and a > > tablescan node & would appreciate the community's help on the same. > > > > Thanks & Regards, > > Pranav > > > > > -- > > Best, > Benchao Li >
