无法使用 aws_s3.query_export_to_s3 函数将 AWS RDS Postgres 表导出到 S3 中的 CSV [英] Unable to export AWS RDS Postgres table to CSV in S3, using aws_s3.query_export_to_s3 function

问题描述

我密切关注有关将 AWS RDS Postgres 表作为 CSV 导出到 S3 的文档，但仍然无法使其工作.文档网址

更具体地说，在创建 aws_s3 扩展后

如果不存在则创建扩展 aws_s3 CASCADE;

我试图执行这个函数:

SELECT * from aws_s3.query_export_to_s3('select * from users limit 10', 'sample-s3-bucket', '/users_demo.csv');

失败并出现以下错误:

<块引用>

[42883] 错误:函数 aws_s3.query_export_to_s3(未知，未知，未知)不存在提示:没有函数匹配给定的名称和参数类型.您可能需要添加显式类型转换.

没有记录此错误(或者我找不到相关文档).扩展中似乎缺少 aws_s3.query_export_to_s3 函数！

我尝试查看此函数 aws_s3.query_export_to_s3 是否确实缺失.我已经试过了:

1. 列出可用的扩展显示 aws_s3 esxtension 已安装:

SELECT * FROM pg_available_extensions where name like '%aw%';

结果:

 名称 |default_version |安装版本|评论-------------+------------------+------+---------------------------------------------aws_s3 |1.0 |1.0 |用于从 S3 导入数据的 AWS S3 扩展aws_commons |1.0 |1.0 |跨 AWS 服务的通用数据类型(2 行)

2. 列出扩展函数不会显示 query_export_to_s3 函数:

SELECT e.extname, ne.nspname AS extschema, p.proname, np.nspname AS proschemaFROM pg_catalog.pg_extension AS eINNER JOIN pg_catalog.pg_depend AS d ON (d.refobjid = e.oid)内部连接 ​​pg_catalog.pg_proc AS p ON (p.oid = d.objid)INNER JOIN pg_catalog.pg_namespace AS ne ON (ne.oid = e.extnamespace)INNER JOIN pg_catalog.pg_namespace AS np ON (np.oid = p.pronamespace)WHERE d.deptype = 'e' AND e.extname like '%aws%'按 1、3 排序；

结果:

 扩展名 |extschema |名誉|原图-------------+-----------+------------------------+------------aws_commons |公共|create_aws_credentials |aws_commonsaws_commons |公共|create_s3_uri |aws_commonsaws_s3 |公共|table_import_from_s3 |aws_s3aws_s3 |公共|table_import_from_s3 |aws_s3(4 行)

3. 最后，删除并重新创建扩展 aws_s3 不起作用.

更多信息:PostgreSQL 12.3 on x86_64-pc-linux-gnu.

任何人都可以确认这个功能实际上是缺失的吗?换句话说，任何人都可以使用这个功能吗?

解决方案

尝试升级到 Postgres 12.4.我遇到了类似的问题，这就是 AWS 支持告诉我的(回复粘贴在下面).[已编辑]

更新

一开始我还没有完全搞定这个工作，但可以确认升级到 Postgres 12.4，并且删除并重新创建扩展工作.

DROP EXTENSION aws_s3 CASCADE;删除扩展 aws_commons 级联；创建扩展 aws_s3 级联；

AWS Support 的原始回复:

基于 describe-db-engine-versions[1] 的输出，我只能看到以下特定引擎版本支持 s3Export 功能.因此12.2 版本不支持导出到 S3 功能.

<预><代码>[{引擎":postgres"，引擎版本":10.14"，支持的功能名称":[s3Import"，s3Export"]},{引擎":postgres"，引擎版本":11.9"，支持的功能名称":[s3Import"，s3Export"]},{引擎":postgres"，引擎版本":12.4"，支持的功能名称":[s3Import"，s3Export"]]]

I followed closely the documentation regarding exporting AWS RDS Postgres tables to S3 as CSV and still could not make it work. Documentation URL

More specifically, after creating the aws_s3 extension

CREATE EXTENSION IF NOT EXISTS aws_s3 CASCADE;

I tried to execute this function:

SELECT * from aws_s3.query_export_to_s3('select * from users limit 10', 'sample-s3-bucket', '/users_demo.csv');

which failed with the following error:

[42883] ERROR: function aws_s3.query_export_to_s3(unknown, unknown, unknown) does not exist Hint: No function matches the given name and argument types. You might need to add explicit type casts.

This error is not documented (or I could not find relevant documentation). It seems the aws_s3.query_export_to_s3 function is actually missing from the extension!

I tried to see if this function aws_s3.query_export_to_s3 is actually missing. I have already tried:

1. Listing the available extensions shows aws_s3 esxtension as installed:

SELECT * FROM pg_available_extensions where name like '%aw%';

Result:

    name     | default_version | installed_version |                   comment                   
-------------+-----------------+-------------------+---------------------------------------------
 aws_s3      | 1.0             | 1.0               | AWS S3 extension for importing data from S3
 aws_commons | 1.0             | 1.0               | Common data types across AWS services
(2 rows)

2. Listing the extension functions does not show the query_export_to_s3 function:

SELECT e.extname, ne.nspname AS extschema, p.proname, np.nspname AS proschema
FROM pg_catalog.pg_extension AS e
         INNER JOIN pg_catalog.pg_depend AS d ON (d.refobjid = e.oid)
         INNER JOIN pg_catalog.pg_proc AS p ON (p.oid = d.objid)
         INNER JOIN pg_catalog.pg_namespace AS ne ON (ne.oid = e.extnamespace)
         INNER JOIN pg_catalog.pg_namespace AS np ON (np.oid = p.pronamespace)
WHERE d.deptype = 'e' AND e.extname like '%aws%'
ORDER BY 1, 3;

Result:

   extname   | extschema |        proname         |  proschema  
-------------+-----------+------------------------+-------------
 aws_commons | public    | create_aws_credentials | aws_commons
 aws_commons | public    | create_s3_uri          | aws_commons
 aws_s3      | public    | table_import_from_s3   | aws_s3
 aws_s3      | public    | table_import_from_s3   | aws_s3
(4 rows)

3. Finally, Dropping and recreating the extension aws_s3 did not work.

More info: PostgreSQL 12.3 on x86_64-pc-linux-gnu.

Can anyone please confirm that this function is actually missing? In other words, can anyone use this function?

解决方案

Try upgrading to Postgres 12.4. I'm having a similar problem and that's what AWS support told me (response pasted below). [edited]

Update

Initially I hadn't fully got this working, but can confirm upgrading to Postgres 12.4, and dropping and recreating the extension worked.

DROP EXTENSION aws_s3 CASCADE;
DROP EXTENSION aws_commons CASCADE;
CREATE EXTENSION aws_s3 CASCADE;

Original response from AWS Support:

Based on output of describe-db-engine-versions[1] I can see that only the below specific engine versions support s3Export feature. Hence version 12.2 does not support export to S3 feature.

[
    {
        "Engine": "postgres",
        "EngineVersion": "10.14",
        "SupportedFeatureNames": [
            "s3Import",
            "s3Export"
        ]
    },
    {
        "Engine": "postgres",
        "EngineVersion": "11.9",
        "SupportedFeatureNames": [
            "s3Import",
            "s3Export"
        ]
    },
    {
        "Engine": "postgres",
        "EngineVersion": "12.4",
        "SupportedFeatureNames": [
            "s3Import",
            "s3Export"
        ]
    } ]

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