By default, the cache that ORC input structure employs to retailer the ORC file footer makes use of tough references for your cached item. Placing this to real can help steer clear of out-of-memory challenges under memory tension (in some instances) at the cost of slight unpredictability in In general question efficiency.
Amount of entries extra into the Team BY aggregation hash just before a recomputation of common entry sizing is executed.
For conditional joins, if enter stream from a small alias could be straight placed on the join operator with no filtering or projection, the alias needn't be pre-staged from the dispersed cache by way of a mapred neighborhood undertaking. At the moment, it's not dealing with vectorization or Tez execution engine.
Specifies a totally competent area user to work with when binding to LDAP for authentication, instead of using the consumer alone. This permits for scenarios wherever all users don't have research permissions on LDAP, in its place necessitating just the bind consumer to have search permissions.
This assets is Utilized in LDAP search queries when acquiring LDAP team names that a particular consumer belongs to. The value with the LDAP attribute, indicated by this house, ought to be a full DN for the person or the small username or userid.
Makes essential schema on the startup if one particular won't exist. Established this to false, following making it when.
String applied as being a prefix when car building column alias. By default the prefix label will probably be appended using a column placement selection to type the column alias. Auto technology would materialize if an mixture purpose is Employed in a choose clause devoid of an specific alias.
Test if a query approach consists of a cross product. When there is one particular, output a warning for the session's console.
Location this assets to legitimate will have HiveServer2 execute Hive functions as being the consumer producing the calls to it.
In rigorous method, the consumer need to specify at the least a single static partition in the event the user unintentionally overwrites all partitions. original site In nonstrict manner all partitions are permitted to be dynamic.
Make column names distinctive in The end result set by qualifying column names with table alias if required. Table alias are going to be extra to column names for queries of form "pick *" or if question explicitly utilizes desk alias "select r1.x..".
This limits the number of partitions that can be asked for with the Metastore for the provided table. A query won't be executed if it makes an attempt to fetch much more partitions for every table check my site when compared to the Restrict configured.
Whether or not to optimize multi team by question to create just one M/R position approach. If the multi team by query has typical team by keys, it will be optimized to generate only one M/R career. (This configuration house was taken out in release 0.nine.0.)
Name in the natural environment variable that retains the one of a kind script operator ID during the person's rework operate (the customized mapper/reducer that the person has laid out in the query).