Github user NathanHowell commented on a diff in the pull request:
https://github.com/apache/spark/pull/16386#discussion_r100474809
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonParser.scala
---
@@ -48,69 +47,102 @@ class JacksonParser(
// A `ValueConverter` is responsible for converting a value from
`JsonParser`
// to a value in a field for `InternalRow`.
- private type ValueConverter = (JsonParser) => Any
+ private type ValueConverter = JsonParser => AnyRef
// `ValueConverter`s for the root schema for all fields in the schema
- private val rootConverter: ValueConverter = makeRootConverter(schema)
+ private val rootConverter = makeRootConverter(schema)
private val factory = new JsonFactory()
options.setJacksonOptions(factory)
private val emptyRow: Seq[InternalRow] = Seq(new
GenericInternalRow(schema.length))
+ private val corruptFieldIndex =
schema.getFieldIndex(options.columnNameOfCorruptRecord)
+
@transient
- private[this] var isWarningPrintedForMalformedRecord: Boolean = false
+ private var printWarningForMalformedRecord: (() => UTF8String) => Unit =
{ record =>
+ def sampleRecord: String = {
+ if (options.wholeFile) {
+ ""
+ } else {
+ s"Sample record: ${record()}\n"
+ }
+ }
+
+ def footer: String = {
+ s"""Code example to print all malformed records (scala):
+ |===================================================
+ |// The corrupted record exists in column
${options.columnNameOfCorruptRecord}.
+ |val parsedJson = spark.read.json("/path/to/json/file/test.json")
+ |
+ """.stripMargin
+ }
+
+ if (options.permissive) {
+ logWarning(
+ s"""Found at least one malformed record. The JSON reader will
replace
+ |all malformed records with placeholder null in current
$PERMISSIVE_MODE parser mode.
+ |To find out which corrupted records have been replaced with
null, please use the
+ |default inferred schema instead of providing a custom schema.
+ |
+ |${sampleRecord ++ footer}
+ |
+ """.stripMargin)
+ } else if (options.dropMalformed) {
+ logWarning(
+ s"""Found at least one malformed 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 $PERMISSIVE_MODE
+ |mode and use the default inferred schema.
+ |
+ |${sampleRecord ++ footer}
+ |
+ """.stripMargin)
+ }
+
+ printWarningForMalformedRecord = _ => ()
--- End diff --
@cloud-fan please take a look at aafe7bded6e614dddaed74d15cecfb8b1a78a639,
I hope this is more clear
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