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https://issues.apache.org/jira/browse/NIFI-2157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381468#comment-15381468
]
ASF GitHub Bot commented on NIFI-2157:
--------------------------------------
Github user JPercivall commented on a diff in the pull request:
https://github.com/apache/nifi/pull/645#discussion_r71087628
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/GenerateTableFetch.java
---
@@ -0,0 +1,253 @@
+/*
+ * 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.nifi.processors.standard;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.TriggerSerially;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.components.state.StateManager;
+import org.apache.nifi.components.state.StateMap;
+import org.apache.nifi.dbcp.DBCPService;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessSessionFactory;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processors.standard.db.DatabaseAdapter;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.text.ParseException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+
+@TriggerSerially
+@InputRequirement(Requirement.INPUT_FORBIDDEN)
+@Tags({"sql", "select", "jdbc", "query", "database", "fetch", "generate"})
+@SeeAlso(QueryDatabaseTable.class)
--- End diff --
Should the other SQL processors (especially the ones that could accept this
as input) be added?
> Add GenerateTableFetch processor
> --------------------------------
>
> Key: NIFI-2157
> URL: https://issues.apache.org/jira/browse/NIFI-2157
> Project: Apache NiFi
> Issue Type: Sub-task
> Reporter: Matt Burgess
> Assignee: Matt Burgess
> Fix For: 1.0.0
>
>
> This processor would presumably operate like QueryDatabaseTable, except it
> will contain a "Partition Size" property, and rather than executing the SQL
> statement(s) to fetch rows, it would generate flow files containing SQL
> statements that will select rows from a table. If the partition size is
> indicated, then the SELECT statements will refer to a range of rows, such
> that each statement will grab only a portion of the table. If max-value
> columns are specified, then only rows whose observed values for those columns
> exceed the current maximum will be fetched (i.e. like QueryDatabaseTable).
> These flow files (due to NIFI-1973) can be passed to ExecuteSQL processors
> for the actual fetching of rows, and ExecuteSQL can be distributed across
> cluster nodes and/or multiple tasks. These features enable distributed
> incremental fetching of rows from database table(s).
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