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docker-pgredshift's Issues

Failed scripts when using the container but were OK when run in AWS RS

CREATE TABLE public.__yuniql_schema_version(
    sequence_id  INT IDENTITY(1,1) PRIMARY KEY NOT NULL,
    version VARCHAR(512) NOT NULL,
    applied_on_utc TIMESTAMP NOT NULL DEFAULT(GETDATE()),
    applied_by_user VARCHAR(128) NOT NULL DEFAULT(CURRENT_USER),
    applied_by_tool VARCHAR(32) NOT NULL,
    applied_by_tool_version VARCHAR(16) NOT NULL,
    status VARCHAR(32) NOT NULL,
    duration_ms INTEGER NOT NULL,
    checksum VARCHAR(64) NOT NULL,
    failed_script_path VARCHAR(4000) NULL,
    failed_script_error VARCHAR(4000) NULL,
    additional_artifacts VARCHAR(4000) NULL,
    CONSTRAINT ix___yuniql_schema_version UNIQUE(version)
);
ERR   2021-12-30 21:32:40Z   Failed to execute run function. 42601: syntax error at or near "IDENTITY"
Diagnostics stack trace captured a Npgsql.PostgresException (0x80004005): 

It expects a 'dev' database in Redshift which is "postgres" in pgsql

SELECT 1 from pg_database WHERE datname = 'yuniqldb';

ERR   2021-12-30 21:35:45Z   Failed to execute run function. 3D000: database "dev" does not exist
Diagnostics stack trace captured a Npgsql.PostgresException (0x80004005): 

Testing framework

It would be great to have a framework that we could test created functions against expected results.

For example, testing

SELECT getdate();

would ensure that the added function would return a TIMESTAMP and its value is what we expected. These tests would be more complex when testing lots of inputs (see this PR).

I don't know if there is a framework to do this easily but I suspect it will require an additional dependency and the value of ensuring the functions work across postgres versions would be worth it.

json_extract_array_element_text for strings

Compare:
select json_extract_array_element_text('["Sandwich", "Omelette", "Tikka Masala"]', 0)

In Redshift, that gets you an unquoted Sandwich, in docker-pgredshift that gets you a double-quoted "Sandwich".

Adding .strip('"') to the json.dumps seems to solve it:

CREATE FUNCTION json_extract_array_element_text(json_array text, array_index int) RETURNS text immutable as $$
    import json
    result = json.loads(json_array)[array_index]
    return json.dumps(result).strip('"')
    $$ LANGUAGE plpythonu;

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