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

From: Derrick Stolee <redacted>

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 <redacted>
---
 t/t1092-sparse-checkout-compatibility.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh
index 380a085f8ec4..b937d7096afd 100755
--- a/t/t1092-sparse-checkout-compatibility.sh
+++ b/t/t1092-sparse-checkout-compatibility.sh

@@ -456,8 +456,9 @@ test_expect_success 'sparse-index is not expanded' '
 	init_repos &&
 
 	rm -f trace2.txt &&
+	echo >>sparse-index/untracked.txt &&
 	GIT_TRACE2_EVENT="$(pwd)/trace2.txt" GIT_TRACE2_EVENT_NESTING=10 \
-		git -C sparse-index status -uno &&
+		git -C sparse-index status &&
 	test_region ! index ensure_full_index trace2.txt
 '
 

-- 
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