Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14929#discussion_r77304677
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JacksonParser.scala
---
@@ -62,8 +68,39 @@ class JacksonParser(
throw new RuntimeException(s"Malformed line in FAILFAST mode:
$record")
}
if (options.dropMalformed) {
- logWarning(s"Dropping malformed line: $record")
+ if (!isWarningPrintedForMalformedRecord) {
+ logWarning(
+ s"""Found at least one malformed records (sample: $record). The
JSON reader will drop
+ |all malformed records in current $DROP_MALFORMED_MODE parser
mode. To find out which
+ |corrupted records have been dropped, please switch the
parser mode to $PERMISSIVE_MODE
+ |mode and use the default inferred schema.
+ |
+ |Code example to print all malformed records (scala):
+ |===================================================
+ |// The corrupted record exists in column
${columnNameOfCorruptRecord}
+ |val parsedJson =
spark.read.json("/path/to/json/file/test.json")
+ |
+ """.stripMargin)
+ isWarningPrintedForMalformedRecord = true
+ }
Nil
+ } else if (schema.getFieldIndex(columnNameOfCorruptRecord).isEmpty) {
+ if (!isWarningPrintedForMalformedRecord) {
+ logWarning(
+ s"""Found at least one malformed records (sample: $record). The
JSON reader will replace
--- End diff --
should we make a common method to produce this error message?
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