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Store hash key/value pairs in one ordered vector

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Replace the parallel std::vector<json_object_ptr> keys / values on
json_hash with a single std::vector<json_entry>, where json_entry is
a small {key, value} aggregate. This still preserves insertion order
(the property the parallel vectors were providing) but removes the
"keep two vectors in lockstep" pattern, and call sites can now use
range-for with structured bindings:

    for (auto &[k, v] : o->entries()) { ... }

Side effects:

* sizeof(json_hash) drops from 72 to 48 bytes (one fewer vector
  header), matching json_array.
* The keys() and values() accessors on json_object are replaced by a
  single entries() accessor returning std::vector<json_entry>&.
* All call sites were swept from the old paired-index pattern
  (`o->keys()[i]` / `o->values()[i]`) to entry-based access. Where the
  original pattern relied on `nprop = 0` to short-circuit iteration on
  a null or non-hash `properties`, the rewrite now guards the loop
  explicitly with `if (o->type == JSON_HASH)` so that calling
  entries() doesn't trip the asserting downcast.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Erica Fischer
2026-05-30 17:49:13 -07:00
co-authored by Cursor
parent f366b2c4aa
commit 4d9a48c3d4
11 changed files with 122 additions and 137 deletions
Download Patch File Download Diff File Expand all files Collapse all files
plugin.cpp
+11 -9
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@@ -343,18 +343,20 @@ serial_feature parse_feature(json_pull_ptr jp, int z, unsigned x, unsigned y, st
}
}
for (size_t i = 0; i < properties->keys().size(); i++) {
serial_val v = stringify_value(properties->values()[i], "Filter output", jp->line, j);
if (properties->type == JSON_HASH) {
for (const auto &e : properties->entries()) {
serial_val v = stringify_value(e.value, "Filter output", jp->line, j);
// Nulls can be excluded here because the expression evaluation filter
// would have already run before prefiltering
// Nulls can be excluded here because the expression evaluation filter
// would have already run before prefiltering
if (v.type != mvt_null) {
sf.full_keys.push_back(key_pool.pool(properties->keys()[i]->string()));
sf.full_values.push_back(v);
if (v.type != mvt_null) {
sf.full_keys.push_back(key_pool.pool(e.key->string()));
sf.full_values.push_back(v);
if (!postfilter) {
add_to_tilestats(ts->second.tilestats, properties->keys()[i]->string(), v);
if (!postfilter) {
add_to_tilestats(ts->second.tilestats, e.key->string(), v);
}
}
}
}