HiveQL’s analyze command will be extended to trigger statistics computation on one or more column in a Hive table/partition. ]tablename [PARTITION(partcol1[=val1], partcol2[=val2], ...)] -- (Note: Fully support qualified table name since Hive 1.2.0, see HIVE-10007.) partition.stats = true; analyze table yourTable compute statistics for columns; ORC files. COMPUTE STATISTICS [FOR COLUMNS] -- (Note: Hive 0.10.0 and later.) Hive’s job invokes a lot of Map/Reduce and generates a lot of intermediate data, by setting the above parameter compresses the Hive’s intermediate data before writing it … set hive.compute.query.using.stats=true; set hive.stats.fetch.column.stats=true; set hive.stats.fetch.partition.stats=true; 10. Your email address will not be published. partition_spec. The user has to explicitly set the boolean variable hive.stats.autogather to false so that statistics are not automatically computed and stored into Hive MetaStore. A data scientist’s perspective. Discover the Hive OS network statistics on coins, algorithms, etc COMPUTE STATS语句对文本表没有任何限制。这些表可以通过Impala或Hive创建。 COMPUTE STATS语句适用于拼花表。这些表可以通过Impala或Hive创建。 COMPUTE STATS语句可以不受CDH 5.4 / Impala 2.2或更高版本中Avro表的限制。 The HiveQL in order to compute column statistics is as follows: Technical strengths include Hadoop, YARN, Mapreduce, Hive, Sqoop, Flume, Pig, HBase, Phoenix, Oozie, Falcon, Kafka, Storm, Spark, MySQL and Java. (3 replies) i am trying to compute statistics on ORC File but i am unable see any changes in PART_COL_STATS as well on using set hive.compute.query.using.stats=true; set hive.stats.reliable=true; set hive.stats.fetch.column.stats=true; set hive.stats.fetch.partition.stats=true; set hive.cbo.enable=true; to get max value of a column it is running full Map reduce on column .. what … When set to true, Hive uses statistics stored in its metastore to answer simple queries like count(*). table_name column_name [PARTITION (partition_spec)]." Overrides: init in class GenericUDAFEvaluator Parameters: m - The mode of aggregation. As discussed in the previous recipe, Hive provides the analyze command to compute table or partition statistics. The same command could be used to compute statistics for one or more column of a Hive table or partition. table_identifier [database_name.] Recent Suggestions. BedWars. prinsese1. Statistics serve as the input to the cost functions of the optimizer so that it can compare different plans and choose among them. Parameters. ANALYZE statements must be transparent and not affect the performance of DML statements. To speed up COMPUTE STATS consider the following options which can be combined. Hive is Hadoop’s SQL interface over HDFS which gives a … The ANALYZE TABLE COMPUTE STATISTICS statement can compute statistics for Parquet data stored in tables, columns, and directories within dfs storage plugins only. table_name: A table name, optionally qualified with a database name. Statistics serve as the input to the cost functions of the Hive optimizer so that it can compare different plans and choose best among them. Did you know we have forums? A custom MetastoreEventListeneris triggered. The Hive Staff Team. < name > hive.compute.query.using.stats < / name > < value > true < / value > < description > When set to true Hive will answer a few queries like count (1) purely using stats stored in metastore. ANALYZE COMPUTE STATISTICS comes in three flavors in Apache Hive. Source: https://www.cloudera.com/documentation/enterprise/5-9-x/topics/impala_compute_stats.html, Your email address will not be published. To display these statistics, use DESCRIBE FORMATTED [ db_name.] Senior Hadoop developer with 4 years of experience in designing and architecture solutions for the Big Data domain and has been involved with several complex engagements. 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