changed for loop to while (just to make sonar happy). removed unused imports and undeprecated ClickHouseUtils as we use it

Author: chernser

clickhouse-data/src/main/java/com/clickhouse/data/ClickHouseColumn.java

@@ -688,9 +688,12 @@ public static void parseJSONColumn(String args, List<ClickHouseColumn> nestedCol
         String name = null;
         ClickHouseColumn column = null;
         StringBuilder builder = new StringBuilder();
-        for (int i = 0, len = args.length(); i < len; i++) {
+        int i =0;
+        int len = args.length();
+        while (i < len) {
             char ch = args.charAt(i);
             if (Character.isWhitespace(ch)) {
+                i++;
                 continue;
             }
 
@@ -709,12 +712,15 @@ public static void parseJSONColumn(String args, List<ClickHouseColumn> nestedCol
             } else if (column == null) { // now type
                 LinkedList<ClickHouseColumn> colList = new LinkedList<>();
                 i = readColumn(args, i, len, name, colList) - 1;
-                nestedColumns.add(column = colList.getFirst());
+                column = colList.getFirst();
+                nestedColumns.add(column);
             } else { // prepare for next column
                 i = ClickHouseUtils.skipContentsUntil(args, i, len, ',') - 1;
                 name = null;
                 column = null;
             }
+
+            i++;
         }
     }
 

clickhouse-data/src/main/java/com/clickhouse/data/ClickHouseUtils.java

@@ -51,7 +51,6 @@
 import java.util.function.Supplier;
 import java.util.function.UnaryOperator;
 
-@Deprecated
 public final class ClickHouseUtils {
     private static final boolean IS_UNIX;
     private static final boolean IS_WINDOWS;

client-v2/src/main/java/com/clickhouse/client/api/data_formats/internal/BinaryStreamReader.java

@@ -1,7 +1,6 @@
 package com.clickhouse.client.api.data_formats.internal;
 
 import com.clickhouse.client.api.ClientException;
-import com.clickhouse.client.api.DataTransferException;
 import com.clickhouse.data.ClickHouseColumn;
 import com.clickhouse.data.ClickHouseDataType;
 import com.clickhouse.data.ClickHouseEnum;
@@ -36,8 +35,6 @@
 import java.util.Set;
 import java.util.TimeZone;
 import java.util.UUID;
-import java.util.function.Function;
-import java.util.stream.Collectors;
 
 /**
  * This class is not thread safe and should not be shared between multiple threads.