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Allow multiple tile features to have the same join key

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This commit is contained in:
Erica Fischer
2025-01-08 08:41:08 -08:00
parent cfd877267e
commit d17a911db5
1 changed files with 18 additions and 16 deletions
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tile-join.cpp
+7 -5
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@@ -92,7 +92,7 @@ std::vector<std::vector<std::map<std::string, mvt_value>>> get_joined_rows(sqlit
std::string query = s;
sqlite3_free((void *) s);
std::map<std::string, size_t> key_to_row;
std::multimap<std::string, size_t> key_to_row;
for (size_t i = 0; i < join_keys.size(); i++) {
const mvt_value &v = join_keys[i];
@@ -129,13 +129,14 @@ std::vector<std::vector<std::map<std::string, mvt_value>>> get_joined_rows(sqlit
if (count > 0) {
// join key is 0th column of query
std::string key = (const char *) sqlite3_column_text(stmt, 0);
auto f = key_to_row.find(key);
if (f == key_to_row.end()) {
auto f = key_to_row.equal_range(key);
if (f.first == f.second) {
fprintf(stderr, "Unexpected join key: %s\n", key.c_str());
continue;
}
if (ret[f->second].size() < join_count_limit) {
for (auto ff = f.first; ff != f.second; ++ff) {
if (ret[ff->second].size() < join_count_limit) {
for (int i = 1; i < count; i++) {
int type = sqlite3_column_type(stmt, i);
mvt_value v;
@@ -151,7 +152,8 @@ std::vector<std::vector<std::map<std::string, mvt_value>>> get_joined_rows(sqlit
row.emplace(name, v);
}
ret[f->second].push_back(std::move(row));
ret[ff->second].push_back(row);
}
}
}
}