feat(snowflake)!: support transpilation of TRY_TO_BINARY from Snowflake to DuckDB

[fivetran-felixhuang]

https://docs.snowflake.com/en/sql-reference/functions/try_to_binary

The difference between TRY_TO_BINARY and TO_BINARY is that TRY_TO_BINARY returns NULL when TO_BINARY throws an error. Also TRY_TO_BINARY returns NULL if the format is not HEX, BASE64, or UTF-8.

We can achieve this be using transpilation method tobinary_sql and wrap the transpiled query with TRY(). If the format specified is invalid, we return NULL directly.

source query:
SELECT
TRY_TO_BINARY('48656C6C6F', 'HEX') AS valid_hex,
TRY_TO_BINARY('Hello', 'UTF-8') AS valid_utf8,
TRY_TO_BINARY('SGVsbG8=', 'BASE64') AS valid_base64,
TRY_TO_BINARY('invalid_hex', 'HEX') AS invalid_hex,
TRY_TO_BINARY('48656C6C6F', 'UTF-16') AS invalid_format,
TRY_TO_BINARY('invalid==', 'BASE64') AS invalid_base64;

transpiled query:
SELECT
TRY(UNHEX('48656C6C6F')) AS "VALID_HEX",
TRY(ENCODE('Hello')) AS "VALID_UTF8",
TRY(FROM_BASE64('SGVsbG8=')) AS "VALID_BASE64",
TRY(UNHEX('invalid_hex')) AS "INVALID_HEX",
TRY(NULL) AS "INVALID_FORMAT",
TRY(FROM_BASE64('invalid==')) AS "INVALID_BASE64"

-- (wrapped with HEX so we can see the blob value directly)
SELECT
HEX(TRY(UNHEX('48656C6C6F'))) AS "VALID_HEX",
HEX(TRY(ENCODE('Hello'))) AS "VALID_UTF8",
HEX(TRY(FROM_BASE64('SGVsbG8='))) AS "VALID_BASE64",
HEX(TRY(UNHEX('invalid_hex'))) AS "INVALID_HEX",
HEX(TRY(NULL)) AS "INVALID_FORMAT",
HEX(TRY(FROM_BASE64('invalid=='))) AS "INVALID_BASE64"

[github-actions]

SQLGlot Integration Test Results

Comparing:

• this branch (sqlglot:transpile_snowflake_duckdb_try_to_binary, sqlglot version: transpile_snowflake_duckdb_try_to_binary)
• baseline (main, sqlglot version: 28.5.1.dev34)

⚠️ Limited to dialects: duckdb, snowflake

By Dialect

dialect	main	sqlglot:transpile_snowflake_duckdb_try_to_binary	difference	links
duckdb -> duckdb	4003/4003 passed (100.0%)	4003/4003 passed (100.0%)	No change	full result / delta
snowflake -> duckdb	626/1085 passed (57.7%)	626/1085 passed (57.7%)	No change	full result / delta
snowflake -> snowflake	981/1085 passed (90.4%)	981/1085 passed (90.4%)	No change	full result / delta

Overall

main: 6173 total, 5610 passed (pass rate: 90.9%), sqlglot version: 28.5.1.dev34

sqlglot:transpile_snowflake_duckdb_try_to_binary: 6173 total, 5610 passed (pass rate: 90.9%), sqlglot version: transpile_snowflake_duckdb_try_to_binary

Difference: No change

[VaggelisD]

Looks good overall @fivetran-felixhuang! Got only a few minor comments: