Github user MaxGekk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21657#discussion_r201042748
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/UnivocityParser.scala
---
@@ -38,24 +38,28 @@ class UnivocityParser(
requiredSchema: StructType,
val options: CSVOptions) extends Logging {
require(requiredSchema.toSet.subsetOf(dataSchema.toSet),
- "requiredSchema should be the subset of schema.")
+ "requiredSchema should be the subset of dataSchema.")
def this(schema: StructType, options: CSVOptions) = this(schema, schema,
options)
// A `ValueConverter` is responsible for converting the given value to a
desired type.
private type ValueConverter = String => Any
+ // This index is used to reorder parsed tokens
+ private val tokenIndexArr =
+ requiredSchema.map(f =>
java.lang.Integer.valueOf(dataSchema.indexOf(f))).toArray
--- End diff --
Just in case, we can do an optimization by memory here. The array is used
under the flag `options.columnPruning` only. We can create an empty array (or
null) if `options.columnPruning` is set to `false`.
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