Thank you for fixing. On Tue, Nov 07, 2017 at 09:00:43PM +0100, Dmitry Dolgov wrote: > > > +Datum > > > +custom_subscripting_parse(PG_FUNCTION_ARGS) > > > +{ > > > + bool isAssignment = PG_GETARG_BOOL(0); > > > > Here isAssignment is unused variable, so it could be removed. > > In this case I disagree - the purpose of these examples is to show > everything > you can use. So I just need to come up with some example that involves > `isAssignment`.
Understood. > > > > + scratch->d.sbsref.eval_finfo = eval_finfo; > > > + scratch->d.sbsref.nested_finfo = nested_finfo; > > > + > > As I mentioned earlier we need assigning eval_finfo and nested_finfo only > for EEOP_SBSREF_OLD, EEOP_SBSREF_ASSIGN and EEOP_SBSREF_FETCH steps. > > Also they should be assigned before calling ExprEvalPushStep(), not > after. Otherwise some bugs may appear in future. > > I'm really confused about this one. Can you tell me the exact line numbers? > Because if I remove any of these lines "blindly", tests are failing. Field scratch->d is union. Its fields should be changed only before calling ExprEvalPushStep(), which copies 'scratch'. To be more specific I attached the patch 0005-Fix-ExprEvalStep.patch, which can be applyed over your patches. Some other notes are below. > <replaceable > class="parameter">type_modifier_output_function</replaceable> and > - <replaceable class="parameter">analyze_function</replaceable> > + <replaceable class="parameter">analyze_function</replaceable>, > + <replaceable class="parameter">subscripting_parse_function</replaceable> > + <replaceable class="parameter">subscripting_assign_function</replaceable> > + <replaceable class="parameter">subscripting_fetch_function</replaceable> I think you forgot commas and conjunction 'and'. > + The optional > + <replaceable class="parameter">subscripting_parse_function</replaceable>, > + <replaceable class="parameter">subscripting_assign_function</replaceable> > + <replaceable class="parameter">subscripting_fetch_function</replaceable> > + contains type-specific logic for subscripting of the data type. Here you forgot comma or 'and'. Also 'contain' should be used instead 'contains'. It seems that in the following you switched descriptions: > + <term><replaceable > class="parameter">subscripting_assign_function</replaceable></term> > + <listitem> > + <para> > + The name of a function that contains type-specific subscripting logic > for > + fetching an element from the data type. > + </para> subscripting_assign_function is used for updating. > + <term><replaceable > class="parameter">subscripting_fetch_function</replaceable></term> > + <listitem> > + <para> > + The name of a function that contains type-specific subscripting logic > for > + updating an element in the data type. > + </para> subscripting_fetch_function is used for fetching. I have a little complain about how ExprEvalStep gets resvalue. resvalue is assigned in one place (within ExecEvalSubscriptingRefFetch(), ExecEvalSubscriptingRefAssign()), resnull is assigned in another place (within jsonb_subscript_fetch(), jsonb_subscript_assign()). I'm not sure that it is a good idea, but it is not critical, it is just complaint. After your fixing I think we should wait for opinion of senior community members and mark the patch as 'Ready for Commiter'. Maybe I will do more tests and try to implement subscripting to another type. -- Arthur Zakirov Postgres Professional: http://www.postgrespro.com Russian Postgres Company
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c index c275387319..42a0d31c31 100644 --- a/src/backend/executor/execExpr.c +++ b/src/backend/executor/execExpr.c @@ -2350,9 +2350,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *aref, PlanState fmgr_info(aref->refnestedfunc, nested_finfo); } - scratch->d.sbsref.eval_finfo = eval_finfo; - scratch->d.sbsref.nested_finfo = nested_finfo; - /* Fill constant fields of SubscriptingRefState */ arefstate->isassignment = isAssignment; arefstate->refelemtype = aref->refelemtype; @@ -2377,9 +2374,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *aref, PlanState scratch->d.jump.jumpdone = -1; /* adjust later */ ExprEvalPushStep(state, scratch); - scratch->d.sbsref.eval_finfo = eval_finfo; - scratch->d.sbsref.nested_finfo = nested_finfo; - adjust_jumps = lappend_int(adjust_jumps, state->steps_len - 1); } @@ -2425,9 +2419,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *aref, PlanState scratch->d.sbsref_subscript.jumpdone = -1; /* adjust later */ ExprEvalPushStep(state, scratch); - scratch->d.sbsref.eval_finfo = eval_finfo; - scratch->d.sbsref.nested_finfo = nested_finfo; - adjust_jumps = lappend_int(adjust_jumps, state->steps_len - 1); i++; @@ -2462,9 +2453,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *aref, PlanState scratch->d.sbsref_subscript.jumpdone = -1; /* adjust later */ ExprEvalPushStep(state, scratch); - scratch->d.sbsref.eval_finfo = eval_finfo; - scratch->d.sbsref.nested_finfo = nested_finfo; - adjust_jumps = lappend_int(adjust_jumps, state->steps_len - 1); i++; @@ -2499,10 +2487,9 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *aref, PlanState { scratch->opcode = EEOP_SBSREF_OLD; scratch->d.sbsref.state = arefstate; - ExprEvalPushStep(state, scratch); - scratch->d.sbsref.eval_finfo = eval_finfo; scratch->d.sbsref.nested_finfo = nested_finfo; + ExprEvalPushStep(state, scratch); } /* SBSREF_OLD puts extracted value into prevvalue/prevnull */ @@ -2521,10 +2508,9 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *aref, PlanState /* and perform the assignment */ scratch->opcode = EEOP_SBSREF_ASSIGN; scratch->d.sbsref.state = arefstate; - ExprEvalPushStep(state, scratch); - scratch->d.sbsref.eval_finfo = eval_finfo; scratch->d.sbsref.nested_finfo = nested_finfo; + ExprEvalPushStep(state, scratch); } else @@ -2532,10 +2518,9 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *aref, PlanState /* array fetch is much simpler */ scratch->opcode = EEOP_SBSREF_FETCH; scratch->d.sbsref.state = arefstate; - ExprEvalPushStep(state, scratch); - scratch->d.sbsref.eval_finfo = eval_finfo; scratch->d.sbsref.nested_finfo = nested_finfo; + ExprEvalPushStep(state, scratch); }
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