Enhance the parser so that it can deal with test cases from ClickHouse repo

Author: zhicwu

src/main/java/ru/yandex/clickhouse/ClickHouseStatementImpl.java

@@ -13,6 +13,7 @@
 import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;
 import java.util.UUID;
@@ -584,7 +585,7 @@ private String extractDBAndTableName(String sql) {
     private boolean extractWithTotals(String sql) {
         if (Utils.startsWithIgnoreCase(sql, "select")) {
             String withoutStrings = Utils.retainUnquoted(sql, '\'');
-            return withoutStrings.toLowerCase().contains(" with totals");
+            return withoutStrings.toLowerCase(Locale.ROOT).contains(" with totals");
         }
         return false;
     }

src/main/java/ru/yandex/clickhouse/jdbc/parser/ClickHouseSqlStatement.java

@@ -3,6 +3,7 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Map.Entry;
 
@@ -52,7 +53,7 @@ public ClickHouseSqlStatement(String sql, StatementType stmtType, String cluster
                 Integer position = e.getValue();
 
                 if (keyword != null && position != null) {
-                    p.put(keyword.toUpperCase(), position);
+                    p.put(keyword.toUpperCase(Locale.ROOT), position);
                 }
             }
             this.positions = Collections.unmodifiableMap(p);
@@ -145,7 +146,7 @@ public int getStartPosition(String keyword) {
         int position = -1;
 
         if (!this.positions.isEmpty() && keyword != null) {
-            Integer p = this.positions.get(keyword.toUpperCase());
+            Integer p = this.positions.get(keyword.toUpperCase(Locale.ROOT));
             if (p != null) {
                 position = p.intValue();
             }