[pg] Segfault at select current_database()

[rekby]

Segfault at SELECT current_database();

Reproduce:

1. Run local_ydb with postgres experiment enabled https://github.com/ydb-platform/ydb/wiki/Local-run-postgres-tests
2. Connect to YDB with psql: psql postgres://root:1234@localhost:5432/local
3. echo 'SELECT current_database()' | psql postgres://root:1234@localhost:5432/local

Stacktrace

#0  0x00007f81707905ca in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00000000564691d2 in namestrcpy (name=0x7f8153290170, str=0x0)
    at /home/rekby/ydbwork/ydb/ydb/library/yql/parser/pg_wrapper/postgresql/src/backend/utils/adt/name.c:236
#2  0x0000000056460628 in current_database (fcinfo=0x7f8153290130)
    at /home/rekby/ydbwork/ydb/ydb/library/yql/parser/pg_wrapper/postgresql/src/backend/utils/adt/misc.c:179
#3  0x0000000055d52652 in NYql::TPgResolvedCall<false>::DoCall (this=0x477fffbd7580, callInfo=...)
    at /home/rekby/ydbwork/ydb/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp:1000
#4  0x0000000055d52282 in NYql::TPgResolvedCall<false>::DoCalculate (this=0x477fffbd7580, compCtx=...)
    at /home/rekby/ydbwork/ydb/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp:990
#5  0x0000000055d516d4 in NKikimr::NMiniKQL::TMutableComputationNode<NYql::TPgResolvedCall<false>>::GetValue(NKikimr::NMiniKQL::TComputationContext&) const (
    this=0x477fffbd7580, compCtx=...) at /home/rekby/ydbwork/ydb/ydb/library/yql/minikql/computation/mkql_computation_node_impl.h:217
#6  0x0000000042a4603b in NKikimr::NMiniKQL::TArrayNode::DoCalculate (this=0x477ff12b23d0, ctx=...)
    at /-B/ydb/library/yql/minikql/computation/llvm14/mkql_computation_node_holders_codegen.cpp:244
#7  0x0000000042a45164 in NKikimr::NMiniKQL::TMutableComputationNode<NKikimr::NMiniKQL::TArrayNode>::GetValue (this=0x477ff12b23d0, compCtx=...)
    at /home/rekby/ydbwork/ydb/ydb/library/yql/minikql/computation/mkql_computation_node_impl.h:214
#8  0x0000000042a4603b in NKikimr::NMiniKQL::TArrayNode::DoCalculate (this=0x477ff12b2460, ctx=...)
    at /-B/ydb/library/yql/minikql/computation/llvm14/mkql_computation_node_holders_codegen.cpp:244
#9  0x0000000042a45164 in NKikimr::NMiniKQL::TMutableComputationNode<NKikimr::NMiniKQL::TArrayNode>::GetValue (this=0x477ff12b2460, compCtx=...)
    at /home/rekby/ydbwork/ydb/ydb/library/yql/minikql/computation/mkql_computation_node_impl.h:214
#10 0x000000004b9261f0 in NKikimr::NMiniKQL::(anonymous namespace)::TIteratorWrapper::DoCalculate (this=0x477ff12b24f0, ctx=...)
    at /-B/ydb/library/yql/minikql/comp_nodes/llvm14/mkql_iterator.cpp:21
#11 0x000000004b925564 in NKikimr::NMiniKQL::TMutableComputationNode<NKikimr::NMiniKQL::(anonymous namespace)::TIteratorWrapper>::GetValue (this=0x477ff12b24f0,
    compCtx=...) at /home/rekby/ydbwork/ydb/ydb/library/yql/minikql/computation/mkql_computation_node_impl.h:214
#12 0x0000000042eeddcf in NKikimr::NMiniKQL::(anonymous namespace)::TComputationGraph::GetValue (this=0x477fffa3b620)
    at /-B/ydb/library/yql/minikql/computation/llvm14/mkql_computation_node_graph.cpp:623
#13 0x000000004de363bf in NYql::NDq::TDqTaskRunner::Run (this=0x477fff80b700) at /home/rekby/ydbwork/ydb/ydb/library/yql/dq/runtime/dq_tasks_runner.cpp:703
#14 0x000000005289626f in NYql::NDq::TDqSyncComputeActorBase<NKikimr::NKqp::TKqpComputeActor>::DoExecuteImpl (this=0x477ff0781e00)
    at /home/rekby/ydbwork/ydb/ydb/library/yql/dq/actors/compute/dq_sync_compute_actor_base.h:52
#15 0x0000000052895a0e in NYql::NDq::TDqComputeActorBase<NKikimr::NKqp::TKqpComputeActor, NYql::NDq::TComputeActorAsyncInputHelperForTaskRunner>::DoExecute (
    this=0x477ff0781e00) at /home/rekby/ydbwork/ydb/ydb/library/yql/dq/actors/compute/dq_compute_actor_impl.h:297
#16 0x00000000528b2651 in NYql::NDq::TDqComputeActorBase<NKikimr::NKqp::TKqpComputeActor, NYql::NDq::TComputeActorAsyncInputHelperForTaskRunner>::HandleExecuteBase (
    this=0x477ff0781e00, ev=Python Exception <class 'gdb.error'>: There is no member named T_.
) at /home/rekby/ydbwork/ydb/ydb/library/yql/dq/actors/compute/dq_compute_actor_impl.h:1094
#17 0x0000000052894b1c in NYql::NDq::TDqComputeActorBase<NKikimr::NKqp::TKqpComputeActor, NYql::NDq::TComputeActorAsyncInputHelperForTaskRunner>::BaseStateFuncBody (
    this=0x477ff0781e00, ev=TAutoPtr<NActors::IEventHandle> = {...}) at /home/rekby/ydbwork/ydb/ydb/library/yql/dq/actors/compute/dq_compute_actor_impl.h:246
#18 0x000000005289364f in NKikimr::NKqp::TKqpComputeActor::StateFunc (this=0x477ff0781e00, ev=TAutoPtr<NActors::IEventHandle> = {...})
    at /home/rekby/ydbwork/ydb/ydb/core/kqp/compute_actor/kqp_pure_compute_actor.cpp:131
#19 0x000000003ccb286e in NActors::TActorCallbackBehaviour::Receive (this=0x477ff0781e30, actor=0x477ff0781e00, ev=TAutoPtr<NActors::IEventHandle> = {...})
    at /home/rekby/ydbwork/ydb/ydb/library/actors/core/actor.cpp:232
#20 0x000000003cd20ec3 in NActors::IActor::Receive (this=0x477ff0781e00, ev=TAutoPtr<NActors::IEventHandle> = {...})
    at /home/rekby/ydbwork/ydb/ydb/library/actors/core/actor.h:526
#21 0x000000003cd185be in NActors::TGenericExecutorThread::Execute<NActors::TMailboxTable::THTSwapMailbox> (this=0x477ffcf80b00, mailbox=0x477ffb941600, hint=4184,
    isTailExecution=false) at /home/rekby/ydbwork/ydb/ydb/library/actors/core/executor_thread.cpp:244
#22 0x000000003cd0c56d in NActors::TGenericExecutorThread::ProcessExecutorPool(NActors::IExecutorPool*)::$_0::operator()(unsigned int, bool) const (
    this=0x7f816a42ddc8, activation=4184, isTailExecution=false) at /home/rekby/ydbwork/ydb/ydb/library/actors/core/executor_thread.cpp:425
#23 0x000000003cd0bf45 in NActors::TGenericExecutorThread::ProcessExecutorPool (this=0x477ffcf80b00, pool=0x477ffeec8100)
    at /home/rekby/ydbwork/ydb/ydb/library/actors/core/executor_thread.cpp:478
#24 0x000000003cd0ce2e in NActors::TExecutorThread::ThreadProc (this=0x477ffcf80b00) at /home/rekby/ydbwork/ydb/ydb/library/actors/core/executor_thread.cpp:504
#25 0x0000000039dd45b6 in (anonymous namespace)::ThreadProcWrapper<ISimpleThread> (param=0x477ffcf80b00) at /home/rekby/ydbwork/ydb/util/system/thread.cpp:383
#26 0x0000000039dda24d in (anonymous namespace)::TPosixThread::ThreadProxy (arg=0x477fff5894e0) at /home/rekby/ydbwork/ydb/util/system/thread.cpp:244
#27 0x00007f8170671ac3 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#28 0x00007f8170703850 in ?? () from /lib/x86_64-linux-gnu/libc.so.6

[vitstn]

#1817