REGISTER INDEX TABLE
Function
This command is used to register an index table with the primary table.
Syntax
REGISTER INDEX TABLE indextable_name ON db_name.maintable_name;
Parameter Description
Parameter |
Description |
---|---|
db_name |
Database name. If this parameter is not specified, the current database is selected. |
indextable_name |
Index table name. |
maintable_name |
Primary table name. |
Precautions
Before running this command, run REFRESH TABLE to register the primary table and secondary index table with the Hive metastore.
Examples
create database productdb;
use productdb;
CREATE TABLE productSalesTable(a int,b string,c string) stored as carbondata;
create index productNameIndexTable on table productSalesTable(c) as 'carbondata';
insert into table productSalesTable select 1,'a','aaa';
create database productdb2;
Run the hdfs command to copy productSalesTable and productNameIndexTable in the productdb database to the productdb2 database.
refresh table productdb2.productSalesTable ;
refresh table productdb2.productNameIndexTable ;
explain select * from productdb2.productSalesTable where c = 'aaa'; / The query command does not use an index table.
REGISTER INDEX TABLE productNameIndexTable ON productdb2.productSalesTable;
explain select * from productdb2.productSalesTable where c = 'aaa'; // The query command uses an index table.
System Response
By running this command, the index table will be registered to the primary table.
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