CLUSTERING

This section applies only to MRS 3.2.0 and later versions.

Function

Performs the clustering operation on Hudi tables. For details, see Clustering.

Syntax

Performing clustering:
call run_clustering(table=>'[table]', path=>'[path]', predicate=>'[predicate]', order=>'[order]');
Viewing a clustering plan:
call show_clustering(table=>'[table]', path=>'[path]', limit=>'[limit]');

Parameter Description

**Table 1** Parameters
Parameter	Description	Mandatory
table	Name of the table to be queried. The value can be in the database.tablename format.	No
path	Path of the table to be queried	No
predicate	Predicate sentence to be defined	No
order	Sorting field for clustering	No
limit	Number of query results to display	No

Example

call show_clustering(table => 'hudi_table1');

call run_clustering(table => 'hudi_table1', predicate => '(ts >= 1006L and ts < 1008L) or ts >= 1009L', order => 'ts');

call run_clustering(path => '/user/hive/warehouse/hudi_test2', predicate => "dt = '2021-08-28'", order => 'id');

Precautions

Either table or path must exist. Otherwise, the Hudi table to be clustered cannot be determined.
To cluster a specified partition, refer to the format predicate => "dt = '2021-08-28'".