vvysotskyi commented on code in PR #2516:
URL: https://github.com/apache/drill/pull/2516#discussion_r854816913


##########
contrib/storage-jdbc/src/main/java/org/apache/drill/exec/store/jdbc/JdbcConventionFactory.java:
##########
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.store.jdbc;
+
+import org.apache.calcite.sql.SqlDialect;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class JdbcConventionFactory {
+
+  private final Map<SqlDialect, DrillJdbcConvention> CACHE = new 
ConcurrentHashMap<>();

Review Comment:
   Shouldn't this cache invalidate its entries after some period of time to 
avoid memory leaks?



##########
contrib/storage-jdbc/src/test/java/org/apache/drill/exec/store/jdbc/TestJdbcWriterWithH2.java:
##########
@@ -437,6 +445,7 @@ public void testWithReallyLongFile() throws Exception {
   }
 
   @Test
+  @Ignore

Review Comment:
   Is there any reason why it is ignored?



##########
contrib/storage-jdbc/src/main/java/org/apache/drill/exec/store/jdbc/JdbcStoragePlugin.java:
##########
@@ -31,51 +34,89 @@
 import org.apache.drill.common.AutoCloseables;
 import org.apache.drill.common.exceptions.UserException;
 import org.apache.drill.exec.ops.OptimizerRulesContext;
+import org.apache.drill.exec.proto.UserBitShared.UserCredentials;
 import org.apache.drill.exec.server.DrillbitContext;
 import org.apache.drill.exec.store.AbstractStoragePlugin;
 import org.apache.drill.exec.store.SchemaConfig;
 import org.apache.drill.exec.store.security.UsernamePasswordCredentials;
 import 
org.apache.drill.shaded.guava.com.google.common.annotations.VisibleForTesting;
+import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableSet;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import javax.sql.DataSource;
 
 public class JdbcStoragePlugin extends AbstractStoragePlugin {
 
-  private static final Logger logger = 
LoggerFactory.getLogger(JdbcStoragePlugin.class);
+  static final Logger logger = 
LoggerFactory.getLogger(JdbcStoragePlugin.class);
 
-  private final JdbcStorageConfig config;
-  private final HikariDataSource dataSource;
-  private final SqlDialect dialect;
-  private final DrillJdbcConvention convention;
-  private final JdbcDialect jdbcDialect;
+  private final JdbcStorageConfig jdbcStorageConfig;
+  private final JdbcDialectFactory dialectFactory;
+  private final JdbcConventionFactory conventionFactory;
+  // DataSources for this storage config keyed on JDBC username
+  private final Map<String, HikariDataSource> dataSources = new 
ConcurrentHashMap<>();

Review Comment:
   The same regarding caching here.



##########
contrib/storage-jdbc/src/main/java/org/apache/drill/exec/store/jdbc/JdbcScanBatchCreator.java:
##########
@@ -55,14 +57,22 @@ public CloseableRecordBatch 
getBatch(ExecutorFragmentContext context,
     }
   }
 
-  private ScanFrameworkBuilder createBuilder(OptionManager options, 
JdbcSubScan subScan) {
-    JdbcStorageConfig config = subScan.getConfig();
+  private ScanFrameworkBuilder createBuilder(ExecutorFragmentContext context, 
JdbcSubScan subScan) {
     ScanFrameworkBuilder builder = new ScanFrameworkBuilder();
     builder.projection(subScan.getColumns());
     builder.setUserName(subScan.getUserName());
     JdbcStoragePlugin plugin = subScan.getPlugin();
-    List<ManagedReader<SchemaNegotiator>> readers =
-      Collections.singletonList(new JdbcBatchReader(plugin.getDataSource(), 
subScan.getSql(), subScan.getColumns()));
+    UserCredentials userCreds = 
context.getContextInformation().getQueryUserCredentials();
+    DataSource ds = plugin.getDataSource(userCreds)
+      .orElseThrow(() -> UserException.permissionError().message(
+        "Query user %s could obtain a connection to %s, missing credentials?",

Review Comment:
   could -> could not



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