here's a post-mortem.
#0 0x1200ce58c in ExecEvalFieldSelect (fselect=0x1401615c0,
econtext=0x14016a030, isNull=0x14016ab31 "", isDone=0x0) at execQual.c:1096
#1 0x1200ceafc in ExecEvalExpr (expression=0x1401615f0, econtext=0x0,
isNull=0x14016ab31 "", isDone=0x0) at execQual.c:1234
#2 0x1200cdd74 in ExecEvalFuncArgs (fcache=0x14016aa70, argList=0x14016a030,
econtext=0x14016a030) at execQual.c:603
#3 0x1200cde54 in ExecMakeFunctionResult (fcache=0x14016aa70,
arguments=0x1401616d0, econtext=0x14016a030, isNull=0x11fffdf88 "",
isDone=0x0) at execQual.c:654
#4 0x1200ce224 in ExecEvalOper (opClause=0x1401615f0, econtext=0x14016a030,
isNull=0x11fffdf88 "", isDone=0x0) at execQual.c:841
#5 0x1200cea24 in ExecEvalExpr (expression=0x1401615f0, econtext=0x0,
isNull=0x14016ab31 "", isDone=0x0) at execQual.c:1204
#6 0x1200cec54 in ExecQual (qual=0x14016a1a0, econtext=0x14016a030)
at execQual.c:1356
#7 0x1200cf2a8 in ExecScan (node=0x14016a1d0, accessMtd=0x1200d8320 <SeqNext>)
at execScan.c:129
#8 0x1200d846c in ExecSeqScan (node=0x1401615f0) at nodeSeqscan.c:138
#9 0x1200cc280 in ExecProcNode (node=0x14016a1d0, parent=0x14016a1d0)
at execProcnode.c:284
#10 0x1200ca8c0 in ExecutePlan (estate=0x14016a310, plan=0x14016a1d0,
numberTuples=1, direction=ForwardScanDirection, destfunc=0x140020c20)
at execMain.c:959
#11 0x1200c9b50 in ExecutorRun (queryDesc=0x1401615f0, estate=0x14016a310,
count=0) at execMain.c:199
#12 0x1200d1140 in postquel_getnext (es=0x140160630) at functions.c:324
#13 0x1200d1300 in postquel_execute (es=0x140160630, fcinfo=0x1401604a0,
fcache=0x140160590) at functions.c:417
#14 0x1200d14d8 in fmgr_sql (fcinfo=0x1401604a0) at functions.c:542
#15 0x1200ce09c in ExecMakeFunctionResult (fcache=0x140160480,
arguments=0x14015e810, econtext=0x140119cd0, isNull=0x140160350 "",
isDone=0x11fffe258) at execQual.c:712
#16 0x1200ce2c4 in ExecEvalFunc (funcClause=0x1401615f0, econtext=0x140119cd0,
isNull=0x140160350 "", isDone=0x11fffe258) at execQual.c:883
#17 0x1200cea3c in ExecEvalExpr (expression=0x1401615f0, econtext=0x0,
isNull=0x14016ab31 "", isDone=0x0) at execQual.c:1208
#18 0x1200c8e10 in ExecEvalIter (iterNode=0x1401615f0, econtext=0x14016a030,
isNull=0x1 <Error reading address 0x1: Invalid argument>, isDone=0x0)
at execFlatten.c:56
#19 0x1200ce9b0 in ExecEvalExpr (expression=0x1401615f0, econtext=0x0,
isNull=0x14016ab31 "", isDone=0x0) at execQual.c:1183
#20 0x1200cdd74 in ExecEvalFuncArgs (fcache=0x140160290, argList=0x14016a030,
econtext=0x140119cd0) at execQual.c:603
#21 0x1200cde54 in ExecMakeFunctionResult (fcache=0x140160290,
arguments=0x14015e840, econtext=0x140119cd0, isNull=0x11fffe3a0 "",
isDone=0x11fffe468) at execQual.c:654
#22 0x1200ce2c4 in ExecEvalFunc (funcClause=0x1401615f0, econtext=0x140119cd0,
isNull=0x11fffe3a0 "", isDone=0x11fffe468) at execQual.c:883
#23 0x1200cea3c in ExecEvalExpr (expression=0x1401615f0, econtext=0x0,
isNull=0x14016ab31 "", isDone=0x0) at execQual.c:1208
#24 0x1200ce574 in ExecEvalFieldSelect (fselect=0x14015e720,
econtext=0x14016a030, isNull=0x11fffe3a0 "", isDone=0x0) at execQual.c:1091
#25 0x1200ceafc in ExecEvalExpr (expression=0x1401615f0, econtext=0x0,
isNull=0x14016ab31 "", isDone=0x0) at execQual.c:1234
#26 0x1200c8e10 in ExecEvalIter (iterNode=0x1401615f0, econtext=0x14016a030,
isNull=0x1 <Error reading address 0x1: Invalid argument>, isDone=0x0)
at execFlatten.c:56
#27 0x1200ce9b0 in ExecEvalExpr (expression=0x1401615f0, econtext=0x0,
isNull=0x14016ab31 "", isDone=0x0) at execQual.c:1183
#28 0x1200ceea4 in ExecTargetList (targetlist=0x14015e870,
targettype=0x140160000, values=0x140160260, econtext=0x140119cd0,
isDone=0x11fffe5a8) at execQual.c:1528
#29 0x1200cf1a8 in ExecProject (projInfo=0x0, isDone=0x1) at execQual.c:1751
#30 0x1200d8074 in ExecResult (node=0x14015e5b0) at nodeResult.c:167
#31 0x1200cc238 in ExecProcNode (node=0x14015e5b0, parent=0x14015e5b0)
at execProcnode.c:272
#32 0x1200ca8c0 in ExecutePlan (estate=0x14015eab0, plan=0x14015e5b0,
numberTuples=0, direction=ForwardScanDirection, destfunc=0x1401603a0)
at execMain.c:959
#33 0x1200c9b50 in ExecutorRun (queryDesc=0x1401615f0, estate=0x14015eab0,
count=0) at execMain.c:199
#34 0x12013e5c0 in ProcessQuery (parsetree=0x14015ea80, plan=0x140160000)
at pquery.c:305
#35 0x12013c568 in pg_exec_query_string (
query_string=0x140115310 "SELECT p.hobbies.equipment.name, p.hobbies.name, p.name
FROM person* p;", parse_context=0x1400c5c60) at postgres.c:817
#36 0x12013dd10 in PostgresMain (argv=0x11fffe9a8, real_argv=0x11ffffae8,
username=0x1400b72f9 "pgadmin") at postgres.c:1827
#37 0x12011aef0 in DoBackend (port=0x1400b7080) at postmaster.c:2021
#38 0x12011a888 in BackendStartup (port=0x1400b7080) at postmaster.c:1798
#39 0x12011938c in ServerLoop () at postmaster.c:957
#40 0x120118c10 in PostmasterMain (argv=0x11ffffae8) at postmaster.c:664
#41 0x1200e5980 in main (argv=0x11ffffae8) at main.c:138
