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mongo aggregat用法

pipline = [{“KaTeX parse error: Expected 'EOF', got '}' at position 23: … {'name': name}}̲,{"limit”: 5},
{'KaTeX parse error: Expected 'EOF', got '}' at position 49: … 'abstract': 1}}̲] pipline = [{"match": {‘company_name’: company_name}}, {“KaTeX parse error: Expected 'EOF', got '}' at position 9: skip": 0}̲, {"

limit”: 5},
{“KaTeX parse error: Expected '}', got 'EOF' at end of input: …": 1, "link": "pdf_link”, “abstract”: 1}}]