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https://issues.apache.org/jira/browse/HAWQ-178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15131809#comment-15131809
]
ASF GitHub Bot commented on HAWQ-178:
-------------------------------------
Github user hornn commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/302#discussion_r51834024
--- Diff:
pxf/pxf-json/src/main/java/org/apache/hawq/pxf/plugins/json/parser/PartitionedJsonParser.java
---
@@ -0,0 +1,198 @@
+package org.apache.hawq.pxf.plugins.json.parser;
+
+/*
+ * 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.
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.EnumSet;
+import java.util.List;
+
+import org.apache.hawq.pxf.plugins.json.parser.JsonLexer.JsonLexerState;
+
+/**
+ * A simple parser that can support reading JSON objects from a random
point in JSON text. It reads from the supplied
+ * stream (which is assumed to be positioned at any arbitrary position
inside some JSON text) until it find the first
+ * JSON begin-object "{". From this point on it will keep reading JSON
objects until it finds one containing a member
+ * string that the user supplies.
+ * <p/>
+ * It is not recommended to use this with JSON text where individual JSON
objects that can be large (MB's or larger).
+ */
+public class PartitionedJsonParser {
+
+ private static final int EOF = -1;
+ private final InputStreamReader inputStreamReader;
+ private final JsonLexer lexer;
+ private long bytesRead = 0;
+ private boolean endOfStream;
+
+ public PartitionedJsonParser(InputStream is) {
+ this.lexer = new JsonLexer();
+
+ // You need to wrap the InputStream with an InputStreamReader,
so that it can encode the incoming byte stream as
+ // UTF-8 characters
+ this.inputStreamReader = new InputStreamReader(is,
StandardCharsets.UTF_8);
+ }
+
+ private boolean scanToFirstBeginObject() throws IOException {
+ // seek until we hit the first begin-object
+ char prev = ' ';
+ int i;
+ while ((i = inputStreamReader.read()) != EOF) {
+ char c = (char) i;
+ bytesRead++;
+ if (c == '{' && prev != '\\') {
--- End diff --
`{` and `\\` should probably be consts
> Add JSON plugin support in code base
> ------------------------------------
>
> Key: HAWQ-178
> URL: https://issues.apache.org/jira/browse/HAWQ-178
> Project: Apache HAWQ
> Issue Type: New Feature
> Components: PXF
> Reporter: Goden Yao
> Assignee: Christian Tzolov
> Fix For: backlog
>
> Attachments: PXFJSONPluginforHAWQ2.0andPXF3.0.0.pdf,
> PXFJSONPluginforHAWQ2.0andPXF3.0.0v.2.pdf,
> PXFJSONPluginforHAWQ2.0andPXF3.0.0v.3.pdf
>
>
> JSON has been a popular format used in HDFS as well as in the community,
> there has been a few JSON PXF plugins developed by the community and we'd
> like to see it being incorporated into the code base as an optional package.
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