Can we just use Bindables.BINDABLE_TABLE_SCAN_RULE to translate the table scan to BindableTableScan ?
-- Best, Wang Yanlin At 2019-10-12 17:12:20, "XING JIN" <jinxing.co...@gmail.com> wrote: >Hi Stamatis, >In current code, BindableTableScan is only created by rules of >ProjectTableScanRule and FilterTableScanRule. I think it's better to keep >as it is? >I made a PR for CALCITE-3405 -- https://github.com/apache/calcite/pull/1500 > >The idea of the PR is quite straightforward: >1. Analyze the parent Project -- collect all the needed fields; >2. Column pruning by pushing down the needed fields to BindableTableScan; >3. Adjust RexInputRefs in parent Project > >@Haisheng @Stamatis It would be great if you can give a review when you >have time ~~~ Thanks a lot ! > >Best, >Jin > > >Stamatis Zampetakis <zabe...@gmail.com> 于2019年10月12日周六 下午3:00写道： > >> Hi Rommel, >> >> I was hoping that this could be done at least by RelFieldTrimmer [1]. Are >> you using it already? >> >> Best, >> Stamatis >> >> [1] >> >> https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql2rel/RelFieldTrimmer.java >> >> On Sat, Oct 12, 2019 at 6:06 AM XING JIN <jinxing.co...@gmail.com> wrote: >> >> > Filed a JIRA: >> > https://issues.apache.org/jira/browse/CALCITE-3405 >> > >> > Haisheng Yuan <h.y...@alibaba-inc.com> 于2019年10月12日周六 上午4:34写道： >> > >> > > Yes, definitely. >> > > >> > > You can go through the project expression with InputFinder to find all >> > the >> > > used columns, create a logical project with those columns, and remap >> the >> > > top project with new column indexes. >> > > >> > > On the other hand, instead of creating a new intermidiate pogical >> > project, >> > > we can also update ProjectTableScanRule to accept LogicalProject that >> is >> > > not a simple mapping, and do the same task I mentioned above. >> > > >> > > - Haisheng >> > > >> > > ------------------------------------------------------------------ >> > > 发件人：Rommel Quintanilla<rom...@blazingdb.com> >> > > 日 期：2019年10月12日 03:15:31 >> > > 收件人：<dev@calcite.apache.org> >> > > 主 题：[QUESTION] Pushing up evaluations from LogicalProjects >> > > >> > > Hi, maybe you can help me. >> > > I have this portion from a larger logical plan: >> > > .. >> > > LogicalProject(l_orderkey=[$0], l_suppkey=[$2], *=[*($5, -(1, >> > > $6))]) >> > > LogicalTableScan(table=[[main, lineitem]]) >> > > .. >> > > >> > > Because the LogicalProject above contains an evaluation, the >> > > ProjectTableScanRule can't convert it to a BindableTableScan. >> > > >> > > I wonder if somehow the evaluation could be pushed up more or less like >> > > this: >> > > .. >> > > LogicalProject(l_orderkey=[$0], l_suppkey=[$1], *=[*($2, -(1, $3))]) >> > > LogicalProject(l_orderkey=[$0], l_suppkey=[$2], l_extendedprice=[$5], >> > > l_discount=[$6]]) >> > > LogicalTableScan(table=[[main, lineitem]]) >> > > .. >> > > >> > > Regards. >> > > >> > >>
