MaxGekk commented on a change in pull request #27366: [SPARK-30648][SQL]
Support filters pushdown in JSON datasource
URL: https://github.com/apache/spark/pull/27366#discussion_r373472555
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonParser.scala
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@@ -334,15 +336,19 @@ class JacksonParser(
private def convertObject(
parser: JsonParser,
schema: StructType,
- fieldConverters: Array[ValueConverter]): InternalRow = {
+ fieldConverters: Array[ValueConverter],
+ structFilters: StructFilters = new NoopFilters()): Option[InternalRow] =
{
val row = new GenericInternalRow(schema.length)
var badRecordException: Option[Throwable] = None
+ var skipRow = false
- while (nextUntil(parser, JsonToken.END_OBJECT)) {
+ structFilters.reset()
+ while (!skipRow && nextUntil(parser, JsonToken.END_OBJECT)) {
schema.getFieldIndex(parser.getCurrentName) match {
case Some(index) =>
try {
row.update(index, fieldConverters(index).apply(parser))
+ skipRow = structFilters.skipRow(row, index)
Review comment:
> if we happen to push down predicates that refer nested columns.
I did some experiments, and found out that filters with nested attributes
are not pushed down.
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