There's no direct connection between the parser and the planner, so you'll have to configure the rule sets yourself based on the parser you're using. You could use a second rule, although you might also try avoiding rules altogether and just using RelNode#accept on the root node of your query and use the RexShuttle implementation to visit every RexNode which should cover both cases.
-- Michael Mior mm...@apache.org Le mar. 26 févr. 2019 à 10:50, Muhammad Gelbana <m.gelb...@gmail.com> a écrit : > > I believe > org.apache.calcite.prepare.CalcitePrepareImpl.createPlanner(Context, > Context, RelOptCostFactory) is the correct location to add my rule(s). But > since this should only run when the praser is Babel, I tried to find that > information from within the mentioned method (*createPlanner*) but I > couldn't. Am I missing something or should I pass through such information > to the *createPlanner* method ? > > Another thing, the expression may be in a "Project" too (i.e. SELECT > typname::regproc FROM pg_catalog.pg_type WHERE typname LIKE 'bool') > I suppose I'll have to have 2 rules. One for Project and another for Filter. > > Thanks, > Gelbana > > > On Tue, Feb 26, 2019 at 4:12 PM Michael Mior <mm...@apache.org> wrote: > > > Writing a rule would certainly work. You would want to match a Filter > > RelNode and then perhaps use an implementation of RexShuttle on the > > condition and implement visitCall to check for appropriate casts to be > > transformed into the subquery you want using RexSubQuery.scalar to > > generate the new query. > > > > -- > > Michael Mior > > mm...@apache.org > > > > Le mar. 26 févr. 2019 à 05:55, Muhammad Gelbana <m.gelb...@gmail.com> a > > écrit : > > > > > > I'm willing to implement running PostgreSQL queries involving OID casts > > > > > > *For example:* > > > SELECT * FROM pg_attribute > > > WHERE attrelid = 'mytable'::regclass; > > > > > > *Should be executed as:* > > > SELECT * FROM pg_attribute > > > WHERE attrelid = (SELECT oid FROM pg_class WHERE relname = 'mytable'); > > > > > > Note that *reglass* maps to the *pg_class* table. > > > > > > What is the "calcite way" to implement this ? Should I write a rule ? > > > Or should I rewrite the query before implementing it (I'm not sure where > > is > > > that) ? > > > > > > Thanks, > > > Gelbana > >
