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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="join_rows_produced_limit">
<title>JOIN_ROWS_PRODUCED_LIMIT Query Option</title>
<titlealts audience="PDF">
<navtitle>JOIN ROWS PRODUCED LIMIT</navtitle>
</titlealts>
<prolog>
<metadata>
<data name="Category" value="Impala"/>
<data name="Category" value="Impala Query Options"/>
<data name="Category" value="Scalability"/>
</metadata>
</prolog>
<conbody>
<p>
The <codeph>JOIN_ROWS_PRODUCED_LIMIT</codeph> query option limits the number of join
rows produced by a join node and is used to prevent runaway join queries. A query
is canceled when any one of the joins in the query produces more rows (totaled across
all instances of that join) than the specified limit set by the
<codeph>JOIN_ROWS_PRODUCED_LIMIT</codeph> option.
</p>
<p>
This limit is checked periodically, so it is possible that the actual number of rows
produced may be slightly higher than the limit.
</p>
<p>
The default value of <codeph>0</codeph> specifies that there is no limit on the number of
join rows produced.
</p>
<p>
<b>Type:</b> <codeph>BIGINT</codeph>
</p>
<p>
<b>Allowed values:</b> 0 or positive numbers
</p>
<p>
<b>Default:</b> 0
</p>
<p>
<b>Added in:</b> <keyword keyref="impala40"/>
</p>
</conbody>
</concept>