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feat(system): ENV(name) scalar lookup of one environment variable (S15) - #95
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environment() lists every variable; ENV('PATH') returns one inside an
expression. NULL when unset (so COALESCE works), '' when set-but-empty,
case-insensitive name on Windows via var_os. Registered under a new
System category behind the system-tables feature.
UNNEST(ENV('PATH'), ';') now splits PATH with no FROM clause.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Summary
ENV(name)scalar: the value of one environment variable of this process, for use inside an expression.environment()(S9) lists them all; this is the lookup S9 kept the name free for.COALESCE(ENV('EDITOR'), 'vi')works),''when set-but-empty, NULL for impossible names (empty,=, NUL), error for a non-string name.var_os, soENV('path')findsPathregardless of launching shell; exact on Linux.Systemfunction category, behind thesystem-tablesfeature.UNNEST(ENV('PATH'), ';')splits PATH with noFROM.Docs: new S15 entry in
docs/SYSTEM_TABLES.md; two queries appended toexamples/system_environment.sql.Test plan
src/sql/functions/system.rs(readsCARGO_PKG_NAME, never sets vars)./run_all_tests.shgreen (smoke-only note onexpander_rewritersQ7, which doesn't useENV)cargo check --no-default-features --features redis-cachecompiles (system-tables off)--function-help ENVand--list-functionsshow theSystemcategory🤖 Generated with Claude Code