[VL] the key in unnest Operator only support field

[FelixYBW]

Backend

VL (Velox)

Bug description

Error Source: RUNTIME
Error Code: INVALID_STATE
Reason:  the key in unnest Operator only support field
Retriable: False
Expression: unnestFieldExpr != nullptr
Function: toVeloxPlan
File: /home/binweiyang/gluten/cpp/velox/substrait/SubstraitToVeloxPlan.cc
Line: 751
Stack trace:
# 0  _ZN8facebook5velox7process10StackTraceC1Ei
# 1  _ZN8facebook5velox14VeloxExceptionC1EPKcmS3_St17basic_string_viewIcSt11char_traitsIcEES7_S7_S7_bNS1_4TypeES7_
# 2  _ZN8facebook5velox6detail14veloxCheckFailINS0_17VeloxRuntimeErrorEPKcEEvRKNS1_18VeloxCheckFailArgsET0_
# 3  _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait11GenerateRelE
# 4  _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait3RelE
# 5  _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait12AggregateRelE
# 6  _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait3RelE
# 7  _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait12AggregateRelE
# 8  _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait3RelE
# 9  _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait10ProjectRelE
# 10 _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait3RelE
# 11 _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait9FilterRelE
# 12 _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait3RelE
# 13 _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait10ProjectRelE
# 14 _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait3RelE
# 15 _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait7RelRootE
# 16 _ZN6gluten29SubstraitToVeloxPlanConverter11toVeloxPlanERKN9substrait4PlanE
# 17 _ZN6gluten18VeloxPlanConverter11toVeloxPlanERKN9substrait4PlanESt6vectorINS1_18ReadRel_LocalFilesESaIS6_EE
# 18 _ZN6gluten12VeloxRuntime20createResultIteratorEPNS_13MemoryManagerERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEERKSt6vectorISt10shared_ptrINS_14ResultIteratorEESaISE_EERKSt13unordered_mapIS8_S8_St4hashIS8_ESt8equal_toIS8_ESaISt4pairIS9_S8_EEE
# 19 Java_org_apache_gluten_vectorized_PlanEvaluatorJniWrapper_nativeCreateKernelWithIterator
# 20 0x00007f3fc05bf427

It should fallback if not supported in velox

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