test.sum-n-tuples.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<query xmlns="http://uzh.ch/ddis/katts/query">

	<!-- Send a heart beat every 100 milliseconds. -->
	<heartBeat interval="100" />

	<!-- Before the query is deployed the data files are copied to all nodes 
		with rsync. -->
	<nTupleFileSource id="tickerSource">
		<files>
			<file csvFieldDelimiter="," mimeType="text/comma-separated-values"
				path="data/test.sum.n-tuples">
				<fields>
					<field from="1" to="x" />
				</fields>
			</file>
		</files>
		<numberOfFields>5</numberOfFields>
	</nTupleFileSource>

	<!-- Filter on an n-tuple -->
	<nTupleFilter applyOnSource="tickerSource" id="NTupleFilter_TickerPRC">
		<conditions>
		    <!-- Constant conditions restrict the value of a certain field. -->
			<constantCondition restriction="Sales" item="4" /> 
			<variableCondition>
			<field>1</field>
			<field>2</field>
			<field>3</field>
			</variableCondition>
		</conditions>
		<!-- In this section, the binding of an n-tuple to variable names is defined. -->
		<produces>
		    <!-- The id of the stream the bindings are emitted to. -->
			<stream id="tickerPrice">
			    <!-- List of variables for the binding -->
				<variable type="xs:double" name="ticker_price"
					referencesTo="3" />
				<variable type="xs:string" name="ticker_id" referencesTo="0" />
			</stream>
		</produces>
	</nTupleFilter>

	<fileOutput filePath="data/output.csv" id="fileOutput">
		<consumes>
			<stream maxBufferSize="5" streamId="tickerPrice">
				<shuffleGrouping />
			</stream>
		</consumes>
	</fileOutput>

	<termination />

</query>