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The most memory in bytes that the cached objects can use. Memory utilised is calculated based on believed dimension of tables and partitions while in the cache. Setting it to a destructive benefit disables memory estimation.

Let JDO query pushdown for integral partition columns in metastore. Off by default. This improves metastore general performance for integral columns, especially if there's numerous partitions.

No matter if to get rid of the union and thrust the operators in between union along with the filesink above union. This avoids an additional scan from the output by union.

Whether to rewrite count distinct into two stages, i.e., the very first stage employs various reducers While using the count distinct essential and the second stage uses only one reducer without essential.

Maximum range of rows authorized for just a scaled-down subset of knowledge for easy Restrict, if it is a fetch question. Insert queries will not be restricted by this Restrict.

No matter if to produce a different plan for skewed keys for the tables in the join. This is based around the skewed keys stored during the metadata. At compile time, the plan is broken into different joins: a single to the skewed keys, and another for that remaining keys.

This configuration home is to regulate if only you can find out more do lock on queries that need to execute not less than a single mapred work.

Whether Hive allows the optimization about changing frequent be part of into mapjoin determined by the input file dimensions. If this parameter is on, and also the sum of dimensions for n-1 on the tables/partitions for an n-way join is scaled-down than the size specified by hive.

During query optimization, filters may very well be pushed down while in the operator tree. If this config is true, only pushed down filters continue being within the operator tree, and the initial filter is eradicated. If this config is false, the initial filter is also left from the operator tree at the original spot.

Most number of bytes a script is allowed to emit to standard error (per map-reduce job). This prevents runaway scripts from filling logs partitions to capacity.

The HYBRID mode reads the footers for all documents if you'll find less data official statement files than expected mapper rely, switching above to building one break up per file if the normal file sizes are smaller sized when compared to the default HDFS blocksize.

Even though mr remains the default motor for historic good reasons, it can be alone a historical motor and is also deprecated within the Hive two line (HIVE-12300). It might be removed without the click site need of even further warning.

If a task fails, regardless of whether to offer a backlink within the CLI towards the endeavor with one of the most failures, together with debugging hints if applicable.

This flag need to be set to legitimate to limit use of native vector map be a part of hash tables on the MultiKey in queries applying MapJoin.