Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/436#discussion_r70434388
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/DescribeSchemaHandler.java
---
@@ -0,0 +1,129 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.planner.sql.handlers;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.SerializableString;
+import com.fasterxml.jackson.core.io.CharacterEscapes;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.base.Joiner;
+import org.apache.calcite.schema.SchemaPlus;
+import org.apache.calcite.sql.SqlIdentifier;
+import org.apache.calcite.sql.SqlNode;
+import org.apache.drill.common.exceptions.ExecutionSetupException;
+import org.apache.drill.common.exceptions.UserException;
+import org.apache.drill.common.logical.StoragePluginConfig;
+import org.apache.drill.exec.physical.PhysicalPlan;
+import org.apache.drill.exec.planner.sql.DirectPlan;
+import org.apache.drill.exec.planner.sql.SchemaUtilites;
+import org.apache.drill.exec.planner.sql.parser.SqlDescribeSchema;
+import org.apache.drill.exec.store.StoragePlugin;
+import org.apache.drill.exec.store.dfs.FileSystemSchemaFactory;
+import org.apache.drill.exec.store.dfs.WorkspaceConfig;
+
+import java.util.List;
+import java.util.Map;
+
+import static
com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
+
+public class DescribeSchemaHandler extends DefaultSqlHandler {
+
+ public DescribeSchemaHandler(SqlHandlerConfig config) {
+ super(config);
+ }
+
+ private static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(DescribeSchemaHandler.class);
+ private static final ObjectMapper mapper = new ObjectMapper(new
ObjectMapper().getFactory().setCharacterEscapes(new CharacterEscapes() {
+ @Override
+ public int[] getEscapeCodesForAscii() {
+ // add standard set of escaping characters
+ int[] esc = CharacterEscapes.standardAsciiEscapesForJSON();
+ // don't escape backslash (not to corrupt windows path)
+ esc['\\'] = CharacterEscapes.ESCAPE_NONE;
+ return esc;
+ }
+
+ @Override
+ public SerializableString getEscapeSequence(int i) {
+ // no further escaping (beyond ASCII chars) needed
+ return null;
+ }
+ })).enable(INDENT_OUTPUT);
+
+
+ @Override
+ public PhysicalPlan getPlan(SqlNode sqlNode) {
+ SqlIdentifier schema = ((SqlDescribeSchema) sqlNode).getSchema();
+ SchemaPlus drillSchema =
SchemaUtilites.findSchema(config.getConverter().getDefaultSchema(),
schema.names);
+
+ if (drillSchema != null) {
+ StoragePlugin storagePlugin;
+ try {
+ storagePlugin =
context.getStorage().getPlugin(schema.names.get(0));
+ } catch (ExecutionSetupException e) {
+ throw UserException.validationError()
+ .message("Failure while retrieving storage plugin", e)
+ .build(logger);
+ }
+ String properties;
+ try {
+ properties = getPropertiesAsJsonString(schema.names,
storagePlugin.getConfig());
+ } catch (JsonProcessingException e) {
+ throw UserException.parseError()
--- End diff --
Replaced it with DrillRuntimeException.
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