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[SPARK-6082] [SQL] Provides better error message for malformed rows when caching tables #4842

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[SPARK-6082] [SQL] Provides better error message for malformed rows when caching tables #4842

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11 changes: 11 additions & 0 deletions sql/core/src/main/scala/org/apache/spark/sql/columnar/InMemoryColumnarTableScan.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,17 @@ private[sql] case class InMemoryRelation(
var rowCount = 0
while (rowIterator.hasNext && rowCount < batchSize) {
val row = rowIterator.next()

// Added for SPARK-6082. This assertion can be useful for scenarios when something
// like Hive TRANSFORM is used. The external data generation script used in TRANSFORM
// may result malformed rows, causing ArrayIndexOutOfBoundsException, which is somewhat
// hard to decipher.
assert(
row.size == columnBuilders.size,
s"""Row column number mismatch, expected ${output.size} columns, but got ${row.size}.
|Row content: $row
""".stripMargin)

var i = 0
while (i < row.length) {
columnBuilders(i).appendFrom(row, i)
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