[SPARK-20156][CORE][SQL][STREAMING][MLLIB] Java String toLowerCase "Turkish locale bug" causes Spark problems

## What changes were proposed in this pull request?

Add Locale.ROOT to internal calls to String `toLowerCase`, `toUpperCase`, to avoid inadvertent locale-sensitive variation in behavior (aka the "Turkish locale problem").

The change looks large but it is just adding `Locale.ROOT` (the locale with no country or language specified) to every call to these methods.

## How was this patch tested?

Existing tests.

Author: Sean Owen <sowen@cloudera.com>

Closes #17527 from srowen/SPARK-20156.

1 files changed, 2 insertions, 1 deletions

diff --git a/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/Type.java b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/Type.java
index a96d2ac371..7752ec03a2 100644
--- a/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/Type.java
+++ b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/Type.java
@@ -19,6 +19,7 @@
 package org.apache.hive.service.cli;
 
 import java.sql.DatabaseMetaData;
+import java.util.Locale;
 
 import org.apache.hadoop.hive.common.type.HiveDecimal;
 import org.apache.hive.service.cli.thrift.TTypeId;
@@ -160,7 +161,7 @@ public enum Type {
       if (name.equalsIgnoreCase(type.name)) {
         return type;
       } else if (type.isQualifiedType() || type.isComplexType()) {
-        if (name.toUpperCase().startsWith(type.name)) {
+        if (name.toUpperCase(Locale.ROOT).startsWith(type.name)) {
             return type;
         }
       }