[jira] [Created] (DRILL-4562) NPE when evaluating expression on nested union type

["Steven Phillips (JIRA)" <ji...@apache.org>]

Steven Phillips created DRILL-4562:
--------------------------------------

             Summary: NPE when evaluating expression on nested union type
                 Key: DRILL-4562
                 URL: https://issues.apache.org/jira/browse/DRILL-4562
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Steven Phillips
            Assignee: Steven Phillips


A simple reproduction:
{code}
select typeof(t.a.b) c from `f.json` t
{code}
where f.json contains:
{code}
{a : { b : 1 }}
{a : { b: "hello" }}
{a : { b: { c : 2} }}
{code}
Fails with following:
{code}
(java.lang.NullPointerException) null
    org.apache.drill.exec.vector.complex.FieldIdUtil.getFieldIdIfMatchesUnion():40
    org.apache.drill.exec.vector.complex.FieldIdUtil.getFieldIdIfMatches():141
    org.apache.drill.exec.vector.complex.FieldIdUtil.getFieldId():207
    org.apache.drill.exec.record.SimpleVectorWrapper.getFieldIdIfMatches():101
    org.apache.drill.exec.record.VectorContainer.getValueVectorId():269
    org.apache.drill.exec.physical.impl.ScanBatch.getValueVectorId():325
    org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.getValueVectorId():182
    org.apache.drill.exec.expr.ExpressionTreeMaterializer$MaterializeVisitor.visitSchemaPath():628
    org.apache.drill.exec.expr.ExpressionTreeMaterializer$MaterializeVisitor.visitSchemaPath():217
    org.apache.drill.common.expression.SchemaPath.accept():152
    org.apache.drill.exec.expr.ExpressionTreeMaterializer$MaterializeVisitor.visitFunctionCall():274
    org.apache.drill.exec.expr.ExpressionTreeMaterializer$MaterializeVisitor.visitFunctionCall():217
    org.apache.drill.common.expression.FunctionCall.accept():60
{code}



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