{
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    "id",
    "x",
    "x_equal_null",
    "x_is_null",
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    "x_not_in_rhs"
  ],
  "truth": [
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      null,
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      null,
      null
    ],
    [
      2,
      2,
      null,
      0,
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    "not_in_rhs_no_null": [
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  "left_null_policy": "NOT EXISTS with equality includes NULL left because no equality match is true; exclude it explicitly if required. Empty RHS makes NOT IN true even for NULL in SQLite. Not a universal equivalence claim or imputation.",
  "network_or_app_database_accessed": false
}