[feature](search) introduce lucene bool mode for search function

Author: airborne12

be/src/vec/functions/function_search.cpp

@@ -317,7 +317,8 @@ Status FunctionSearch::evaluate_inverted_index_with_search_param(
 // Aligned with FE QsClauseType enum - uses enum.name() as clause_type
 FunctionSearch::ClauseTypeCategory FunctionSearch::get_clause_type_category(
         const std::string& clause_type) const {
-    if (clause_type == "AND" || clause_type == "OR" || clause_type == "NOT") {
+    if (clause_type == "AND" || clause_type == "OR" || clause_type == "NOT" ||
+        clause_type == "OCCUR_BOOLEAN") {
         return ClauseTypeCategory::COMPOUND;
     } else if (clause_type == "TERM" || clause_type == "PREFIX" || clause_type == "WILDCARD" ||
                clause_type == "REGEXP" || clause_type == "RANGE" || clause_type == "LIST" ||
@@ -377,6 +378,7 @@ InvertedIndexQueryType FunctionSearch::clause_type_to_query_type(
             {"AND", InvertedIndexQueryType::BOOLEAN_QUERY},
             {"OR", InvertedIndexQueryType::BOOLEAN_QUERY},
             {"NOT", InvertedIndexQueryType::BOOLEAN_QUERY},
+            {"OCCUR_BOOLEAN", InvertedIndexQueryType::BOOLEAN_QUERY},
 
             // Non-tokenized queries (exact matching, pattern matching)
             {"TERM", InvertedIndexQueryType::EQUAL_QUERY},
@@ -406,6 +408,20 @@ InvertedIndexQueryType FunctionSearch::clause_type_to_query_type(
     return InvertedIndexQueryType::EQUAL_QUERY;
 }
 
+// Map Thrift TSearchOccur to query_v2::Occur
+static query_v2::Occur map_thrift_occur(TSearchOccur::type thrift_occur) {
+    switch (thrift_occur) {
+    case TSearchOccur::MUST:
+        return query_v2::Occur::MUST;
+    case TSearchOccur::SHOULD:
+        return query_v2::Occur::SHOULD;
+    case TSearchOccur::MUST_NOT:
+        return query_v2::Occur::MUST_NOT;
+    default:
+        return query_v2::Occur::MUST;
+    }
+}
+
 Status FunctionSearch::build_query_recursive(const TSearchClause& clause,
                                              const std::shared_ptr<IndexQueryContext>& context,
                                              FieldReaderResolver& resolver,
@@ -418,6 +434,38 @@ Status FunctionSearch::build_query_recursive(const TSearchClause& clause,
     }
 
     const std::string& clause_type = clause.clause_type;
+
+    // Handle OCCUR_BOOLEAN - Lucene-style boolean query with MUST/SHOULD/MUST_NOT
+    if (clause_type == "OCCUR_BOOLEAN") {
+        auto builder = segment_v2::inverted_index::query_v2::create_occur_boolean_query_builder();
+
+        // Set minimum_should_match if specified
+        if (clause.__isset.minimum_should_match) {
+            builder->set_minimum_number_should_match(clause.minimum_should_match);
+        }
+
+        if (clause.__isset.children) {
+            for (const auto& child_clause : clause.children) {
+                query_v2::QueryPtr child_query;
+                std::string child_binding_key;
+                RETURN_IF_ERROR(build_query_recursive(child_clause, context, resolver, &child_query,
+                                                      &child_binding_key));
+
+                // Determine occur type from child clause
+                query_v2::Occur occur = query_v2::Occur::MUST; // default
+                if (child_clause.__isset.occur) {
+                    occur = map_thrift_occur(child_clause.occur);
+                }
+
+                builder->add(child_query, occur);
+            }
+        }
+
+        *out = builder->build();
+        return Status::OK();
+    }
+
+    // Handle standard boolean operators (AND/OR/NOT)
     if (clause_type == "AND" || clause_type == "OR" || clause_type == "NOT") {
         query_v2::OperatorType op = query_v2::OperatorType::OP_AND;
         if (clause_type == "OR") {