Help Center/ GaussDB(DWS)/ SQL Syntax Reference (9.1.0.x)/ Functions and Operators/ EXTERNAL SCHEMA System Functions
Updated on 2024-09-30 GMT+08:00
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EXTERNAL SCHEMA System Functions

System functions related to EXTERNAL SCHEMA are supported only by clusters of version 8.3.0 or later.

pg_get_external_schema_table_options(text, text)

Description: Obtains the options of an external schema table.

Input parameter: The first input parameter is the external schema name, and the second input parameter is the table name.

Return type: SETOF record

Example:

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SELECT * FROM pg_get_external_schema_table_options('ex_lf', 'test_lf');
 option_name |            option_value
-------------+------------------------------------
 encoding    | utf8
 format      | parquet
 foldername  | /***/***/***
(3 rows)

pg_get_external_schema_table_col(text, text)

Description: Obtains the column information of an external schema table.

Input parameter: The first input parameter is the external schema name, and the second input parameter is the table name.

Return type: SETOF record

Example:

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SELECT * FROM pg_get_external_schema_table_col('ex_lf', 'test_lf');
        col_name        |   col_type    | part_col
------------------------+---------------+----------
 field_smallint         | smallint      | f
 field_int              | int           | f
 field_integer          | int           | f
 fileld_bigint          | bigint        | f
 field_float            | float         | f
 field_double           | double        | f
 field_double_precision | double        | f
 field_decimal          | decimal(10,0) | f
 field_numeric          | decimal(10,0) | f
 field_timestamp        | timestamp     | f
 field_date             | date          | f
 field_varchar          | varchar(5)    | f
 field_char             | char(5)       | f
 field_boolean          | boolean       | f
 field_string           | string        | f
(15 rows)
Parent topic: Functions and Operators