If ORC reader encounters corrupt knowledge, this price will be utilised to find out no matter whether to skip the corrupt facts or throw an exception. The default conduct is usually to throw an exception.
Whether or not be a part of and group by keys on tables are derived and preserved from the QueryPlan. This is beneficial to establish how tables are accessed and to determine if they must be bucketed.
This flag need to be established to accurate to enable vectorized mode on the lower-facet of query execution. The default worth is genuine.
Part of whole memory to be used by map-facet team aggregation hash desk, when this group by is followed by map sign up for.
If That is set to legitimate, mapjoin optimization in Hive/Spark will use supply file dimensions connected with the TableScan operator on the basis from the operator tree, as an alternative to making use of operator statistics.
No matter if to produce a separate strategy for skewed keys with the tables during the be part of. This is predicated within the skewed keys saved inside the metadata. At compile time, the program is damaged into diverse joins: a single with the skewed keys, and the opposite with the remaining keys.
Determine the encoding technique to use while crafting details. Switching this will only have an affect on The sunshine weight encoding for integers. This flag won't alter the compression standard of bigger level compression codec (like ZLIB). Probable possibilities are SPEED and COMPRESSION.
By default, the cache that ORC enter structure makes use of to store the ORC file footer takes advantage of tricky references for your go to this website cached object. Placing this to correct can help steer clear of out-of-memory issues underneath memory stress (occasionally) at the price of slight unpredictability in overall query performance.
Whether or not the version of Hadoop that is operating supports sub-directories for tables/partitions. Quite a few Hive optimizations may be utilized If your Hadoop Edition supports sub-directories for tables/partitions. This assist was included by MAPREDUCE-1501.
The primary difference between this paramater and hive.optimize.skewjoin is that this parameter employs the skew information and facts saved within the metastore to enhance the prepare at compile time by itself. If there is no skew details while in the metadata, this parameter will likely not have any outcome.
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A comma divided listing of builtin UDFs that are not permitted to be executed. A UDF that is A part of the listing will return an error if invoked from a question.
Title of the identifier visit homepage manufacturing unit to implement when creating table/column names and many others. 'datanucleus' is utilized for backward compatibility.
String made use of being a prefix when vehicle building column alias. By default the prefix label will probably be appended using a column placement range to sort the column alias. Car era would transpire if an mixture operate hop over to here is Employed in a find clause with out an explicit alias.