Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/23132#discussion_r237058331
--- Diff: docs/sql-migration-guide-upgrade.md ---
@@ -9,6 +9,8 @@ displayTitle: Spark SQL Upgrading Guide
## Upgrading From Spark SQL 2.4 to 3.0
+ - In Spark version 2.4 and earlier, accepted format of decimals parsed
from JSON is an optional sign ('+' or '-'), followed by a sequence of zero or
more decimal digits, optionally followed by a fraction, optionally followed by
an exponent. Any commas were removed from the input before parsing. Since Spark
3.0, format varies and depends on locale which can be set via JSON option
`locale`. The default locale is `en-US`. To switch back to previous behavior,
set `spark.sql.legacy.decimalParsing.enabled` to `true`.
--- End diff --
I have the same question. Do we need the `DecimalFormat` when locale is
`en-US`?
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