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SPARKC-516: Add column name to the error message in case of conversion error #1155

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SPARKC-516: Add column name to the error message in case of conversion error #1155

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12 changes: 11 additions & 1 deletion ...cassandra-connector/src/main/scala/com/datastax/spark/connector/writer/SqlRowWriter.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,11 @@ import java.util.UUID

import com.datastax.spark.connector.ColumnRef
import com.datastax.spark.connector.cql.TableDef
import com.datastax.spark.connector.types.TypeConversionException
import org.apache.spark.sql.Row

import scala.util.{Failure, Success, Try}


/** A [[RowWriter]] that can write SparkSQL `Row` objects. */
class SqlRowWriter(val table: TableDef, val selectedColumns: IndexedSeq[ColumnRef])
Expand All @@ -23,9 +26,16 @@ class SqlRowWriter(val table: TableDef, val selectedColumns: IndexedSeq[ColumnRe
require(row.size == columnNames.size, s"Invalid row size: ${row.size} instead of ${columnNames.size}.")
for (i <- 0 until row.size) {
val colValue = row(i)
buffer(i) = converters(i).convert(colValue)
buffer(i) = Try(converters(i).convert(colValue)) match {
case Success(value) => value
case Failure(ex: IllegalArgumentException) =>
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The most exceptions I've seen that were hard to track down were either IllegalArgumentException or its subclass.

val columnType = columnTypes(i).scalaTypeName
throw new TypeConversionException(
s"Cannot convert value $colValue of column ${columnNames(i)} to type $columnType", ex)
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The message will look like Cannot convert value somevalue of column somecolumn to type Int without any wrapping of somevalue (like single or double quotes). Any suggestions on how to improve readability?

case Failure(ex) => throw ex
}
}
}
}


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