The MinorType.NULL check is required for handling cases where there can be a
function with a null argument. This can happen, for instance, in
convert_to_JSON like in TestComplexTypeReader testNonExistentFieldConverting()
when trying to convert a non existent field.
See below for the object graph.
this = {DrillFuncHolderExpr@8281}
holder = {DrillSimpleFuncHolder@8279} "DrillSimpleFuncHolder
[functionNames=[convert_toJSON, convert_toSIMPLEJSON],
returnType=MajorType[minor_type: VARBINARY mode: REQUIRED],
nullHandling=NULL_IF_NULL, parameters=[ValueReference
[type=MajorType[minor_type: LATE mode: REQUIRED], name=input]]]"
majorType = {TypeProtos$MajorType@8317} "minor_type: VARBINARY\nmode:
OPTIONAL\n"
interpreter = null
args = {SingletonImmutableList@8315} size = 1
0 = {NullExpression@8285}
t = {TypeProtos$MajorType@8287} "minor_type: NULL\nmode: OPTIONAL\n"
nameUsed = "convert_tojson"
fieldReference = null
pos = {ExpressionPosition@8322}
"org.apache.drill.common.expression.ExpressionPosition@748c42c3[charIndex = -1,
expression = --UNKNOWN EXPRESSION--]"
[ Full content available at: https://github.com/apache/drill/pull/1442 ]
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