Function _process_segments

src/execution_plan/execution_plan.c:150–202

}

static ExecutionPlan **_process_segments(AST *ast) {
	uint nsegments = 0;               // number of segments
	uint seg_end_idx = 0;             // segment clause end index
	uint clause_count = 0;            // number of clauses
	uint seg_start_idx = 0;           // segment clause start index
	AST *ast_segment = NULL;          // segment AST
	uint *segment_indices = NULL;     // array segment bounds
	ExecutionPlan *segment = NULL;    // portion of the entire execution plan
	ExecutionPlan **segments = NULL;  // constructed segments

	clause_count = cypher_ast_query_nclauses(ast->root);

	//--------------------------------------------------------------------------
	// bound segments
	//--------------------------------------------------------------------------

	// retrieve the indices of each WITH clause to properly set
	// the segment's bounds.
	// Every WITH clause demarcates the beginning of a new segment
	segment_indices = AST_GetClauseIndices(ast, CYPHER_AST_WITH);

	// last segment
	array_append(segment_indices, clause_count);
	nsegments = array_len(segment_indices);
	segments = array_new(ExecutionPlan *, nsegments);

	//--------------------------------------------------------------------------
	// process segments
	//--------------------------------------------------------------------------

	seg_start_idx = 0;
	for(uint i = 0; i < nsegments; i++) {
		seg_end_idx = segment_indices[i];

		if((seg_end_idx - seg_start_idx) == 0) continue; // skip empty segment

		// slice the AST to only include the clauses in the current segment
		AST *ast_segment = AST_NewSegment(ast, seg_start_idx, seg_end_idx);

		// create ExecutionPlan segment that represents this slice of the AST
		segment = _process_segment(ast_segment, seg_start_idx, seg_end_idx);
		array_append(segments, segment);

		// The next segment will start where the current one ended.
		seg_start_idx = seg_end_idx;
	}

	// Restore the overall AST.
	QueryCtx_SetAST(ast);
	array_free(segment_indices);

	return segments;
}

static bool _ExecutionPlan_HasLocateTaps
(