Help Center/ MapReduce Service/ Component Operation Guide (LTS)/ Using Hudi/ Hudi SQL Syntax Reference/ DDL/ CREATE TABLE
Updated on 2022-11-18 GMT+08:00
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CREATE TABLE

Function

This command is used to create a Hudi table by specifying the list of fields along with the table options.

Syntax

CREATE TABLE [ IF NOT EXISTS] [database_name.]table_name

[ (columnTypeList)]

USING hudi

[ COMMENT table_comment ]

[ LOCATION location_path ]

[ OPTIONS (options_list) ]

Parameter Description

Table 1 Parameters

Parameter

Description

database_name

Database name that contains letters, digits, and underscores (_).

table_name

Database table name that contains letters, digits, and underscores (_).

columnTypeList

List of comma-separated columns with data types. The column name contains letters, digits, and underscores (_).

using

Uses hudi to define and create a Hudi table.

table_comment

Description of the table.

location_path

HDFS path. If this parameter is set, the Hudi table will be created as an external table.

options_list

List of Hudi table options.
Table 2 Table options

Parameter

Description

primaryKey

Name of the primary key with fields separated by commas (,).

type

Type of the table. 'cow' indicates a copy-on-write (COW) table, and 'mor' indicates a merge-on-read (MOR) table. If this parameter is not specified, the default value is 'cow'.

preCombineField

Pre-Combine field in the table.

payloadClass

Payload classes for data filtering, including default OverwriteWithLatestAvroPayload and multiple preset payloads, such as OverwriteNonDefaultsWithLatestAvroPayload, DefaultHoodieRecordPayload, and EmptyHoodieRecordPayload.

Examples

  • Create a non-partitioned table. 
    -- Create an internal COW table.
create table if not exists hudi_table0 (
id int,
name string,
price double
)  using hudi
options (
type = 'cow',
primaryKey = 'id'
);
    -- Create an external MOR table.
create table if not exists hudi_table1 (
id int,
name string,
price double,
ts bigint
)  using hudi
location '/tmp/hudi/hudi_table1'
options (
type = 'mor',
primaryKey = 'id,name',
preCombineField = 'ts'
);
    -- Create a table without primary keys.
create table if not exists hudi_table2(
id int,
name string,
price double
)  using hudi
options (
type = 'cow'
);
  • Create a partitioned table. 
    create table if not exists hudi_table_p0 (
id bigint,
name string,
ts bigint,
dt string,
hh string
)  using hudi
location '/tmp/hudi/hudi_table_p0'
options (
type = 'cow',
primaryKey = 'id',
preCombineField = 'ts'
)
partitioned by (dt, hh);
  • Create an external table for the Hudi table created using spark-shell or deltastreamer before Hudi 0.9.0. 
    create table h_p1
using hudi
options (
primaryKey = 'id',
preCombineField = 'ts'
)
partitioned by (dt)
location '/path/to/hudi';
  • Create a table and specify table options. 
    create table if not exists h3(
id bigint,
name string,
price double
) using hudi
options (
primaryKey = 'id',
type = 'mor',
hoodie.cleaner.fileversions.retained = '20',
hoodie.keep.max.commits = '20'
);

Precautions

Currently, Hudi does not support the CHAR, VARCHAR, TINYINT, and SMALLINT data types. You are advised to use the string or INT data type.

System Response

The table is successfully created, and the success message is logged in the system.

Parent topic: DDL