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/*
* Copyright (c) 2025-2026 Anton Kundenko <singaraiona@gmail.com>
* All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* Minimum row count for the fused kernel; below it the existing group +
* count-distinct rewrite is already fast enough and the scatter buffers
* are not worth their allocation. */
/* Fused grouped count-distinct: for each distinct value of key_col,
* count the distinct values of val_col over rows [0, nrows) (all rows;
* selection handling is the caller's job — Task 4 only wires the
* unfiltered path and declines otherwise).
* Returns a RAY_TABLE with three I64 columns in this exact order:
* k[out_n], u[out_n], _first[out_n]
* (keys, distinct counts, first source row) in stable first-seen key
* order, or NULL when the shape is unsupported (caller falls back to the
* existing rewrite). key_col/val_col must be flat vectors of
* numeric/temporal/SYM types, including nulls. Float keys in `k` are
* canonical bit encodings; callers restore the source logical type. */
ray_t* ;
/* RAY_OPS_CDFUSE_H */