Method _cache_description_data

tables/table.py:1152–1194

Cache some data which is already in the description. Some information is extracted from `self.description` to build some useful (but redundant) structures: * `self.colnames` * `self.colpathnames` * `self.coldescrs` * `self.coltypes` * `self.c

(self)

        return self._v_objectid

    def _cache_description_data(self) -> None:
        """Cache some data which is already in the description.

        Some information is extracted from `self.description` to build
        some useful (but redundant) structures:

        * `self.colnames`
        * `self.colpathnames`
        * `self.coldescrs`
        * `self.coltypes`
        * `self.coldtypes`
        * `self.coldflts`
        * `self._v_dtype`
        * `self._time64colnames`
        * `self._strcolnames`
        * `self._colenums`

        """
        self.colnames = list(self.description._v_names)
        self.colpathnames = [
            col._v_pathname
            for col in self.description._f_walk()
            if not hasattr(col, "_v_names")
        ]  # bottom-level

        # Find ``time64`` column names.
        self._time64colnames = self._get_type_col_names("time64")
        # Find ``string`` column names.
        self._strcolnames = self._get_type_col_names("string")
        # Get a mapping of enumerated columns to their `Enum` instances.
        self._colenums = self._get_enum_map()

        # Get info about columns
        for colobj in self.description._f_walk(type="Col"):
            colname = colobj._v_pathname
            # Get the column types, types and defaults
            self.coldescrs[colname] = colobj
            self.coltypes[colname] = colobj.type
            self.coldtypes[colname] = colobj.dtype
            self.coldflts[colname] = colobj.dflt

        # Assign _v_dtype for this table
        self._v_dtype = self.description._v_dtype

    def _get_column_instance(self, colpathname: str):
        """Get the instance of the column with the given `colpathname`.