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https://issues.apache.org/jira/browse/PHOENIX-1661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641191#comment-14641191
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ASF GitHub Bot commented on PHOENIX-1661:
-----------------------------------------
Github user twdsilva commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/101#discussion_r35472668
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/expression/JsonPathAsTextExpression.java
---
@@ -0,0 +1,82 @@
+/*
+ * 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.phoenix.expression;
+
+import java.sql.SQLException;
+import java.util.List;
+
+import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
+import org.apache.phoenix.expression.visitor.ExpressionVisitor;
+import org.apache.phoenix.schema.json.PhoenixJson;
+import org.apache.phoenix.schema.tuple.Tuple;
+import org.apache.phoenix.schema.types.PDataType;
+import org.apache.phoenix.schema.types.PJson;
+import org.apache.phoenix.schema.types.PVarchar;
+
+
+public class JsonPathAsTextExpression extends BaseJSONExpression{
+ public JsonPathAsTextExpression(List<Expression> children) {
+ super(children);
+ }
+ public JsonPathAsTextExpression() {
+ }
+ @Override
+ public boolean evaluate(Tuple tuple, ImmutableBytesWritable ptr) {
+ if (!children.get(1).evaluate(tuple, ptr)) {
+ return false;
+ }
+ String[] pattern =decodePath((String)
PVarchar.INSTANCE.toObject(ptr));
+ if (!children.get(0).evaluate(tuple, ptr)) {
+ return false;
+ }
+ PhoenixJson value = (PhoenixJson) PJson.INSTANCE.toObject(ptr,
children.get(0).getSortOrder());
+ try{
+ PhoenixJson
jsonValue=value.getPhoenixJson(pattern);
+ ptr.set(jsonValue.toBytes());
+ return true;
+ }catch(SQLException e)
+ {
+ return false;
+ }
+
+ }
+ private String[] decodePath(String path)
--- End diff --
Change the rhs to be an array.
> Implement built-in functions for JSON
> -------------------------------------
>
> Key: PHOENIX-1661
> URL: https://issues.apache.org/jira/browse/PHOENIX-1661
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: James Taylor
> Labels: JSON, Java, SQL, gsoc2015, mentor
> Attachments: PhoenixJSONSpecification-First-Draft.pdf
>
>
> Take a look at the JSON built-in functions that are implemented in Postgres
> (http://www.postgresql.org/docs/9.3/static/functions-json.html) and implement
> the same for Phoenix in Java following this guide:
> http://phoenix-hbase.blogspot.com/2013/04/how-to-add-your-own-built-in-function.html
> Examples of functions include ARRAY_TO_JSON, ROW_TO_JSON, TO_JSON, etc. The
> implementation of these built-in functions will be impacted by how JSON is
> stored in Phoenix. See PHOENIX-628. An initial implementation could work off
> of a simple text-based JSON representation and then when a native JSON type
> is implemented, they could be reworked to be more efficient.
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