fix security issue and unused imports

Author: chernser

jdbc-v2/src/main/java/com/clickhouse/jdbc/metadata/DatabaseMetaData.java

@@ -828,7 +828,7 @@ public ResultSet getTableTypes() throws SQLException {
 
     private static final ClickHouseColumn DATA_TYPE_COL = ClickHouseColumn.of("DATA_TYPE", ClickHouseDataType.Int32.name()) ;
     @Override
-    @SuppressWarnings({"squid:S2095"})
+    @SuppressWarnings({"squid:S2095", "squid:S2077"})
     public ResultSet getColumns(String catalog, String schemaPattern, String tableNamePattern, String columnNamePattern) throws SQLException {
         //TODO: Best way to convert type to JDBC data type
         // TODO: handle useCatalogs == true and return schema catalog name

jdbc-v2/src/test/java/com/clickhouse/jdbc/PreparedStatementTest.java

@@ -1,6 +1,5 @@
 package com.clickhouse.jdbc;
 
-import com.clickhouse.client.api.data_formats.internal.BinaryStreamReader;
 import org.apache.commons.lang3.RandomStringUtils;
 import org.testng.annotations.Ignore;
 import org.testng.annotations.Test;
@@ -10,11 +9,8 @@
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;
-import java.sql.Timestamp;
 import java.sql.Types;
-import java.time.ZoneId;
 import java.util.Arrays;
-import java.util.Calendar;
 import java.util.GregorianCalendar;
 import java.util.TimeZone;