REFRESH Statement REFRESH Statement The REFRESH statement reloads the metadata for the table from the metastore database and does an incremental reload of the file and block m...

DML Statements DML Statements DML refers to “Data Manipulation Language”, a subset of SQL statements that modify the data stored in tables. Because Impala focuses on query perf...

UPDATE Statement (Impala 2.8 or higher only) UPDATE Statement (Impala 2.8 or higher only) Updates an arbitrary number of rows in a Kudu table. This statement only works for Imp...

RUNTIME_FILTER_MIN_SIZE Query Option (Impala 2.6 or higher only) RUNTIME_FILTER_MIN_SIZE Query Option (Impala 2.6 or higher only) The RUNTIME_FILTER_MIN_SIZE query option adju...

RUNTIME_FILTER_MAX_SIZE Query Option (Impala 2.6 or higher only) RUNTIME_FILTER_MAX_SIZE Query Option (Impala 2.6 or higher only) The RUNTIME_FILTER_MAX_SIZE query option adju...

对比 Kudu Hive事务 HBase 流式处理 对比 Apache Hudi填补了在DFS上处理数据的巨大空白，并可以和这些技术很好地共存。然而， 通过将Hudi与一些相关系统进行对比，来了解Hudi如何适应当前的大数据生态系统，并知晓这些系统在设计中做的不同权衡仍将非常有用。 Kudu Apache Kudu 是一个与Hudi具有...

EXPLAIN Statement EXPLAIN Statement Returns the execution plan for a statement, showing the low-level mechanisms that Impala will use to read the data, divide the work among no...

INVALIDATE METADATA Statement INVALIDATE METADATA Statement Marks the metadata for one or all tables as stale. Required after a table is created through the Hive shell, before ...

TIMESTAMP Data Type TIMESTAMP Data Type In Impala, the TIMESTAMP data type holds a value of date and time. It can be decomposed into year, month, day, hour, minute and seconds...

REVOKE Statement (Impala 2.0 or higher only) REVOKE Statement (Impala 2.0 or higher only) The REVOKE statement revokes roles or privileges on a specified object from groups. ...