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    "# Boolean\n",
    "\n",
    "[[Polars Documentation](https://docs.pola.rs/api/python/stable/reference/expressions/boolean.html)]\n",
    "\n",
    "OpenDP supports a subset of the Polars boolean functions.\n"
   ]
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    "\n",
    "## Is Property\n",
    "\n",
    "Since these expressions are row-by-row, they may be used in row-by-row or aggregation contexts.\n",
    "\n",
    "- `is_null`\n",
    "- `is_not_null`\n",
    "- `is_finite`\n",
    "- `is_not_finite`\n",
    "- `is_nan`\n",
    "- `is_not_nan`\n",
    "\n",
    "The latter four only apply to float types that can be NaN or infinite.\n",
    "\n",
    "The output domain of `is_null` and `is_not_null` does not include null values, even if the input does.\n",
    "These expressions can be useful as part of a predicate function for filtering, or as part of a group-by.\n"
   ]
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   "source": [
    "## Not\n",
    "\n",
    "Commonly used for negating predicates.\n",
    "\n",
    "Less commonly, the input data to `.not_` may be non-boolean, resulting in a bitwise negation.\n",
    "In this setting, all domain descriptors about elements in the column are dropped."
   ]
  }
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