Github user hornn commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/1344#discussion_r171118261
--- Diff:
pxf/pxf-ignite/src/main/java/org/apache/hawq/pxf/plugins/ignite/IgniteResolver.java
---
@@ -0,0 +1,173 @@
+package org.apache.hawq.pxf.plugins.ignite;
+
+/*
+ * 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 org.apache.hawq.pxf.api.OneRow;
+import org.apache.hawq.pxf.api.OneField;
+import org.apache.hawq.pxf.api.io.DataType;
+import org.apache.hawq.pxf.api.utilities.ColumnDescriptor;
+import org.apache.hawq.pxf.api.utilities.InputData;
+import org.apache.hawq.pxf.api.ReadResolver;
+import org.apache.hawq.pxf.api.WriteResolver;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.text.SimpleDateFormat;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.commons.codec.binary.Base64;
+import org.apache.commons.codec.binary.Hex;
+
+import com.google.gson.JsonArray;
+
+
+
+/**
+ * PXF-Ignite resolver class
+ */
+public class IgniteResolver extends IgnitePlugin implements ReadResolver,
WriteResolver {
+ private static final Log LOG = LogFactory.getLog(IgniteResolver.class);
+
+ // HAWQ column descriptors
+ private ArrayList<ColumnDescriptor> columns = null;
+
+ public IgniteResolver(InputData input) throws Exception {
+ super(input);
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Constructor started");
+ }
+
+ columns = input.getTupleDescription();
+
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Constructor successful");
+ }
+ }
+
+ /**
+ * Transform a JsonArray object stored in {@link OneRow} into a List
{@link OneField}
+ */
+ @Override
+ public List<OneField> getFields(OneRow row) throws Exception {
+ JsonArray result = (JsonArray)row.getData();
+ LinkedList<OneField> fields = new LinkedList<OneField>();
+
+ for (int i = 0; i < columns.size(); i++) {
+ Object value = null;
+ OneField oneField = new
OneField(columns.get(i).columnTypeCode(), null);
+
+ // Handle null values
+ if (result.get(i).isJsonNull()) {
+ oneField.val = null;
+ fields.add(oneField);
+ continue;
+ }
+ switch (DataType.get(oneField.type)) {
+ case INTEGER:
+ value = result.get(i).getAsInt();
+ break;
+ case FLOAT8:
+ value = result.get(i).getAsDouble();
+ break;
+ case REAL:
+ value = result.get(i).getAsFloat();
+ break;
+ case BIGINT:
+ value = result.get(i).getAsLong();
+ break;
+ case SMALLINT:
+ value = result.get(i).getAsShort();
+ break;
+ case BOOLEAN:
+ value = result.get(i).getAsBoolean();
+ break;
+ case VARCHAR:
+ case BPCHAR:
+ case TEXT:
+ case NUMERIC:
+ value = result.get(i).getAsString();
+ break;
+ case BYTEA:
+ value =
Base64.decodeBase64(result.get(i).getAsString());
+ break;
+ case TIMESTAMP:
+ value = new SimpleDateFormat("MMM d, yyyy hh:mm:ss
a").parse(result.get(i).getAsString());
+ break;
+ case DATE:
+ value = new
SimpleDateFormat("yyyy-MM-dd").parse(result.get(i).getAsString());
+ break;
+ default:
+ throw new UnsupportedOperationException("Field type
not supported: " + DataType.get(oneField.type).toString()
+ + ", Column : " + columns.get(i).columnName());
+ }
+
+ oneField.val = value;
+ fields.add(oneField);
+ }
+
+ return fields;
+ }
+
+ /**
+ * Create a query string from a List<OneField> for Ignite database
REST API containing INSERT query
+ */
+ @Override
+ public OneRow setFields(List<OneField> record) throws Exception {
+ StringBuilder sb = new StringBuilder();
+ String fieldDivisor = "";
+
+ sb.append("(");
+ for (OneField oneField : record) {
+ sb.append(fieldDivisor);
+ fieldDivisor = ", ";
+ switch (DataType.get(oneField.type)) {
+ case INTEGER:
+ case FLOAT8:
+ case REAL:
+ case BIGINT:
+ case SMALLINT:
+ case BOOLEAN:
+ sb.append(String.valueOf(oneField.val));
+ break;
+ case VARCHAR:
+ case BPCHAR:
+ case TEXT:
+ case NUMERIC:
+ sb.append("'" + String.valueOf(oneField.val) + "'");
+ break;
+ case BYTEA:
+ sb.append("'" +
Hex.encodeHexString((byte[])(oneField.val)) + "'");
--- End diff --
usually getFields and setFields use the same logic (the idea is that if you
write and then read the same data, you will get the same data back). Just
wondering why use here Hex and not Base64 serialization?
---
