Feat(snowflake): transpile FLOOR with scale arg to DuckDB

[treysp]

PARTIALLY TRANSPILABLE: matches Snowflake for typical numeric ranges/scales, but for high-precision inputs results may differ due to floating-point promotion/rounding in DuckDB.

Snowflake supports FLOOR(x[, scale]), where:

• flooring is always toward negative infinity
• scale shifts the flooring position (positive scale = decimal place, negative scale = tens/hundreds, etc.)
• non-integer scale is accepted but effectively casted to an integer before execution

DuckDB doesn’t natively support the scale arg, so:

• We rewrite FLOOR(x, n) as FLOOR(x * POWER(10, n_int)) / POWER(10, n_int) to execute floor against the input shifted by 10^n_int (so only a single decimal place)
  • NOTE: the division operation returns a float even if both inputs are fixed-width
• We pass that value to DuckDB’s ROUND(..., n) to address tiny accumulated floating point error

[github-actions]

SQLGlot Integration Test Results

Comparing:

• this branch (sqlglot:trey/sf-duckdb-floor, sqlglot version: trey/sf-duckdb-floor)
• baseline (main, sqlglot version: 28.3.1.dev13)

⚠️ Limited to dialects: duckdb, snowflake

By Dialect

dialect	main	sqlglot:trey/sf-duckdb-floor	difference	links
duckdb -> duckdb	3539/4003 passed (88.4%)	3549/4003 passed (88.7%)	⬆ improved by 0.2%	full result / delta
snowflake -> duckdb	307/1085 passed (28.3%)	306/1085 passed (28.2%)	⬇ regressed by 0.1%	full result / delta
snowflake -> snowflake	975/1085 passed (89.9%)	975/1085 passed (89.9%)	No change	full result / delta

Overall

main: 6173 total, 4821 passed (pass rate: 78.1%), sqlglot version: 28.3.1.dev13

sqlglot:trey/sf-duckdb-floor: 6173 total, 4830 passed (pass rate: 78.2%), sqlglot version: trey/sf-duckdb-floor

Difference: ⬆ improved by 0.1%

[georgesittas]

Seems reasonable.