// retoor <retoor@molodetz.nl>
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import "dataset" for Dataset
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var ds = Dataset.memory()
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var users = ds["users"]
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users.insert({"name": "Alice"})
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var cols1 = users.columns
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System.print(cols1.containsKey("uid")) // expect: true
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System.print(cols1.containsKey("name")) // expect: true
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System.print(cols1.containsKey("email")) // expect: false
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users.insert({"name": "Bob", "email": "bob@example.com"})
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var cols2 = users.columns
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System.print(cols2.containsKey("email")) // expect: true
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ds.close()
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