I'm not sure if I understand your problem correctly. Are you trying to build some non-SQL interface on top of Drill, to join a set of dynamic tables? Can you give more concrete example?
When Drill handles join over two dynamic tables, except for * column query, the dynamic tables have a list of fields defined, since those fields are referred in the query (even though the planner does not know each field's type). Therefore, the join condition will never be =($1,$1); it would be resolved to reference to left/right tables's fields. On Wed, Jun 1, 2016 at 7:43 PM, Jesse Yates <jya...@apache.org> wrote: > Hi all, > > I'm trying to rewrite a query of a table (ala Table#toRel) to join a set of > dynamic (sub-)tables on a couple of known columns but am getting stuck > building the condition. The sub-tables are not part of the original query, > but rather selected on-the-fly at logical query time. > > I can't use UNION-ALL because, outside of a couple of known columns, the > remainder are completely dynamic. > > Using RelBuilder I can construct the join via a series of scans and then > joins on the known fields[1]. However, this only creates RelInputRefs which > are not at all associated with the current ref numbering because the the > sub-tables are not present in the original query. Thus, we get conditions > like: > (=($1,$1), which looks appears TRUE but actually should reference the > left/right tables' fields. > > I tried playing around with RelRangeRef and manually managing the field > offsets in query (similar to BlackBoard), but that call gets translated > into an actually ALWAYS-TRUE condition and also fails the > JoinUtil#checkCartesianJoin case. > > If I construct the query via standard SQL at the top level (using known > tables), everything works fine, I think because of the ref-numbering to > which I cannot get access in #toRel(). > > Any thoughts on the right way to go about this? > > Thanks much, > Jesse Yates > > > [1] Actually, this meant digging into RelBuilder > <https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/tools/RelBuilder.java#L309> > since dynamic tables require the field names to already be set and then > uses the column name from the list to get the field index
