[PATCH 06/10] dir: use expand_to_path() for sparse directories

From: Derrick Stolee <dstolee@microsoft.com>

The recently-implemented expand_to_path() method can supply position queries a faster response if they are specifically asking for a path within the sparse cone. Since this is the most-common scenario, this provides a significant speedup.

Update t1092-sparse-checkout-compatibility.sh to fully ensure that 'git status' does not expand a sparse index to a full one, even when there exist untracked files.

The performance test script p2000-sparse-operations.sh demonstrates that this is the final hole to fill to allow 'git status' to speed up when using a sparse index:

Test HEAD~1 HEAD ------------------------------------------------------------------------------ 2000.4: git status (sparse-index-v3) 1.50(1.43+0.10) 0.04(0.04+0.03) -97.3% 2000.5: git status (sparse-index-v4) 1.50(1.43+0.10) 0.04(0.03+0.04) -97.3%

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 t/t1092-sparse-checkout-compatibility.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)