luhuayi
177cd61a57
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: luhuayi <luhuayi@huawei.com> Co-committed-by: luhuayi <luhuayi@huawei.com>
24 KiB
Planning Data Export
For details about the data types that can be exported to MRS, see Table 1.
Type |
Type Supported by GaussDB(DWS) Internal Tables (Data Source Table) |
Type Supported by GaussDB(DWS) Write-only Foreign Tables |
Hive Table Type |
|---|---|---|---|
1-byte integer |
TINYINT |
TINYINT (not recommended) |
SMALLINT |
SMALLINT (recommended) |
SMALLINT |
||
2-byte integer |
SMALLINT |
SMALLINT |
SMALLINT |
4-byte integer |
INTEGER, BINARY_INTEGER |
INTEGER |
INT |
8-byte integer |
BIGINT |
BIGINT |
BIGINT |
Single-precision floating point number |
FLOAT4, REAL |
FLOAT4, REAL |
FLOAT |
Double-precision floating point number |
DOUBLE PRECISION, FLOAT8, BINARY_DOUBLE |
DOUBLE PRECISION, FLOAT8, BINARY_DOUBLE |
DOUBLE |
Scientific data type |
DECIMAL, NUMERIC |
DECIMAL[p (,s)] (The maximum precision can reach up to 38.) |
precision ≤ 38: DECIMAL; precision > 38: STRING |
Date type |
DATE |
TIMESTAMP[(p)] [WITHOUT TIME ZONE] |
TIMESTAMP |
|
Time type |
TIME [(p)] [WITHOUT TIME ZONE], TIME [(p)] [WITH TIME ZONE] |
TEXT |
STRING |
TIMESTAMP[(p)] [WITHOUT TIME ZONE], TIMESTAMP[(p)][WITH TIME ZONE], SMALLDATETIME |
TIMESTAMP[(p)] [WITHOUT TIME ZONE] |
TIMESTAMP |
|
INTERVAL DAY (l) TO SECOND (p), INTERVAL [FIELDS] [(p)] |
VARCHAR(n) |
VARCHAR(n) |
|
Boolean type |
BOOLEAN |
BOOLEAN |
BOOLEAN |
CHAR type |
CHAR(n), CHARACTER(n), NCHAR(n) |
CHAR(n), CHARACTER(n), NCHAR(n) |
n ≤ 255: CHAR(n); n > 255: STRING |
VARCHAR type |
VARCHAR(n), CHARACTER VARYING(n), VARCHAR2(n) |
VARCHAR(n) |
n ≤ 65535: VARCHAR(n); n > 65535: STRING |
NVARCHAR2(n) |
TEXT |
STRING |
|
String (large text object) |
TEXT, CLOB |
TEXT, CLOB |
STRING |
Binary type |
BYTEA |
BYTEA |
BINARY |
Monetary type |
MONEY |
NUMERIC |
BIGINT |
For details about HDFS data export or MRS configuration, see the MapReduce Service User Guide.