[sabir-akhadov-localstack]

Snowflake's CREATE EXTERNAL VOLUME did not parse. Example that failed before:

CREATE EXTERNAL VOLUME my_vol STORAGE_LOCATIONS = (
    (NAME = 'loc1' STORAGE_PROVIDER = 'S3' STORAGE_BASE_URL = 's3://bucket/path/'));

This adds CREATE [OR REPLACE] EXTERNAL VOLUME [IF NOT EXISTS], following the merged CREATE WAREHOUSE (#2388). Each storage location is a parenthesized key-value option list. It is parsed generically into the existing KeyValueOptions, so its fields, including the nested ENCRYPTION = (...) list, may appear in any order, as in real Snowflake. Only an empty location is rejected. Semantic checks, such as the required STORAGE_BASE_URL or duplicate fields, are left to the consumer, in line with the parser's permissive stance. The trailing ALLOW_WRITES and COMMENT properties are accepted in either order. The statement round-trips.

See the Snowflake CREATE EXTERNAL VOLUME docs.

DROP EXTERNAL VOLUME was split out into #2750 per review feedback. The related ALTER (#2474), DESC (#2472) and SHOW (#2473) PRs are separate.

[sabir-akhadov-localstack]

Rebased on latest main. @iffyio @LucaCappelletti94 could you take a look when you have a moment? This is the first of the PRs split out of #2397 (#2472 and #2473 are the others; #2474 is stacked on this one).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.30435% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.37%. Comparing base (4c82c3a) to head (aa80fef).

Files with missing lines	Patch %	Lines
src/ast/mod.rs	76.92%	1 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2475      +/-   ##
==========================================
+ Coverage   82.34%   82.37%   +0.02%     
==========================================
  Files          42       42              
  Lines       35263    35332      +69     
  Branches    35263    35332      +69     
==========================================
+ Hits        29039    29106      +67     
+ Misses       2677     2675       -2     
- Partials     3547     3551       +4     

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[LucaCappelletti94]

Hi! Can you please split it into two PRs?

[sabir-akhadov-localstack]

Thanks, done. This PR now covers only CREATE EXTERNAL VOLUME, and DROP EXTERNAL VOLUME is in #2750. The two are independent.