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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _ReadStorageMetadata(self):
 """Reads the task storage metadata."""

    query = 'SELECT key, value FROM metadata'
    self._cursor.execute(query)

    metadata_values = {row[0]: row[1] for row in self._cursor.fetchall()}

    self._compression_format = metadata_values['compression_format']