


class      __lowerCamelCase       :







       def __init__(       self:      List[str] ):






            '''simple docstring'''




            __UpperCamelCase      =       0
            __UpperCamelCase      =       0
            __UpperCamelCase      =       {}







       def 						snake_case_     (       self:      Any,A_:      List[str] ):






            '''simple docstring'''




            if vertex not in self.adjacency:
                 __UpperCamelCase      =       {}
                 self.num_vertices += 1







       def 						snake_case_     (       self:      Optional[Any],A_:      str,A_:      str,A_:      Any ):






            '''simple docstring'''




            self.add_vertex(A_ )
            self.add_vertex(A_ )

            if head == tail:
                 return

            __UpperCamelCase      =       weight
            __UpperCamelCase      =       weight







       def 						snake_case_     (       self:      Dict ):






            '''simple docstring'''




            __UpperCamelCase      =       self.get_edges()
            for edge in edges:
                 __UpperCamelCase      =       edge
                 edges.remove((tail, head, weight) )
            for i in range(len(A_ ) ):
                 __UpperCamelCase      =       list(edges[i] )

            edges.sort(key=lambda A_ : e[2] )
            for i in range(len(A_ ) - 1 ):
                 if edges[i][2] >= edges[i + 1][2]:
                      __UpperCamelCase      =       edges[i][2] + 1
            for edge in edges:
                 __UpperCamelCase      =       edge
                 __UpperCamelCase      =       weight
                 __UpperCamelCase      =       weight







       def __str__(       self:      int ):






            '''simple docstring'''




            __UpperCamelCase      =       """"""
            for tail in self.adjacency:
                 for head in self.adjacency[tail]:
                      __UpperCamelCase      =       self.adjacency[head][tail]
                      string += F'''{head} -> {tail} == {weight}\n'''
            return string.rstrip('\n' )







       def 						snake_case_     (       self:      Optional[int] ):






            '''simple docstring'''




            __UpperCamelCase      =       []
            for tail in self.adjacency:
                 for head in self.adjacency[tail]:
                      output.append((tail, head, self.adjacency[head][tail]) )
            return output







       def 						snake_case_     (       self:      List[Any] ):






            '''simple docstring'''




            return self.adjacency.keys()







       @staticmethod
       def 						snake_case_     (       A_:      Dict=None,A_:      List[Any]=None ):






            '''simple docstring'''




            __UpperCamelCase      =       Graph()
            if vertices is None:
                 __UpperCamelCase      =       []
            if edges is None:
                 __UpperCamelCase      =       []
            for vertex in vertices:
                 g.add_vertex(A_ )
            for edge in edges:
                 g.add_edge(*A_ )
            return g



       class      __lowerCamelCase       :







              def __init__(       self:      Optional[int] ):






                   '''simple docstring'''




                   __UpperCamelCase      =       {}
                   __UpperCamelCase      =       {}







              def __len__(       self:      List[Any] ):






                   '''simple docstring'''




                   return len(self.parent )







              def 						snake_case_     (       self:      Tuple,A_:      Tuple ):






                   '''simple docstring'''




                   if item in self.parent:
                        return self.find(A_ )

                   __UpperCamelCase      =       item
                   __UpperCamelCase      =       0
                   return item







              def 						snake_case_     (       self:      int,A_:      Dict ):






                   '''simple docstring'''




                   if item not in self.parent:
                        return self.make_set(A_ )
                   if item != self.parent[item]:
                        __UpperCamelCase      =       self.find(self.parent[item] )
                   return self.parent[item]







              def 						snake_case_     (       self:      Optional[int],A_:      Tuple,A_:      List[Any] ):






                   '''simple docstring'''




                   __UpperCamelCase      =       self.find(A_ )
                   __UpperCamelCase      =       self.find(A_ )

                   if roota == roota:
                        return roota

                   if self.rank[roota] > self.rank[roota]:
                        __UpperCamelCase      =       roota
                        return roota

                   if self.rank[roota] < self.rank[roota]:
                        __UpperCamelCase      =       roota
                        return roota

                   if self.rank[roota] == self.rank[roota]:
                        self.rank[roota] += 1
                        __UpperCamelCase      =       roota
                        return roota
                   return None







       @staticmethod
       def 						snake_case_     (       A_:      Dict ):






            '''simple docstring'''




            __UpperCamelCase      =       graph.num_vertices

            __UpperCamelCase      =       Graph.UnionFind()
            __UpperCamelCase      =       []
            while num_components > 1:
                 __UpperCamelCase      =       {}
                 for vertex in graph.get_vertices():
                      __UpperCamelCase      =       -1

                 __UpperCamelCase      =       graph.get_edges()
                 for edge in edges:
                      __UpperCamelCase      =       edge
                      edges.remove((tail, head, weight) )
                 for edge in edges:
                      __UpperCamelCase      =       edge
                      __UpperCamelCase      =       union_find.find(A_ )
                      __UpperCamelCase      =       union_find.find(A_ )
                      if seta != seta:
                           if cheap_edge[seta] == -1 or cheap_edge[seta][2] > weight:
                                __UpperCamelCase      =       [head, tail, weight]

                           if cheap_edge[seta] == -1 or cheap_edge[seta][2] > weight:
                                __UpperCamelCase      =       [head, tail, weight]
                 for vertex in cheap_edge:
                      if cheap_edge[vertex] != -1:
                           __UpperCamelCase      =       cheap_edge[vertex]
                           if union_find.find(A_ ) != union_find.find(A_ ):
                                union_find.union(A_,A_ )
                                mst_edges.append(cheap_edge[vertex] )
                                __UpperCamelCase      =       num_components - 1
            __UpperCamelCase      =       Graph.build(edges=A_ )
            return mst






'''simple docstring'''







import contextlib
import os
import sqlitea

import pytest

from datasets import Dataset, Features, Value
from datasets.io.sql import SqlDatasetReader, SqlDatasetWriter

from ..utils import assert_arrow_memory_doesnt_increase, assert_arrow_memory_increases, require_sqlalchemy


def 	SCREAMING_SNAKE_CASE_					(  _UpperCAmelCase	:	Any    ,_UpperCAmelCase	:	str  )  ->			Dict:
       assert isinstance(_UpperCAmelCase    ,_UpperCAmelCase  )
       assert dataset.num_rows == 4
       assert dataset.num_columns == 3
       assert dataset.column_names == ["col_1", "col_2", "col_3"]
       for feature, expected_dtype in expected_features.items():
              assert dataset.features[feature].dtype == expected_dtype


@require_sqlalchemy
@pytest.mark.parametrize("""keep_in_memory"""    ,[False, True]  )
def 	SCREAMING_SNAKE_CASE_					(  _UpperCAmelCase	:	Optional[Any]    ,_UpperCAmelCase	:	Optional[int]    ,_UpperCAmelCase	:	Optional[int]    ,_UpperCAmelCase	:	str  )  ->			Optional[Any]:
       _a    : Any     					=tmp_path / """cache"""
       _a    : int     					={"""col_1""": """string""", """col_2""": """int64""", """col_3""": """float64"""}
       with assert_arrow_memory_increases() if keep_in_memory else assert_arrow_memory_doesnt_increase():
              _a    : Tuple     					=SqlDatasetReader(
                  """dataset"""    ,"""sqlite:///""" + sqlite_path    ,cache_dir=_UpperCAmelCase    ,keep_in_memory=_UpperCAmelCase  ).read()
       _check_sql_dataset(_UpperCAmelCase    ,_UpperCAmelCase  )


@require_sqlalchemy
@pytest.mark.parametrize(
    """features"""    ,[
        None,
        {"""col_1""": """string""", """col_2""": """int64""", """col_3""": """float64"""},
        {"""col_1""": """string""", """col_2""": """string""", """col_3""": """string"""},
        {"""col_1""": """int32""", """col_2""": """int32""", """col_3""": """int32"""},
        {"""col_1""": """float32""", """col_2""": """float32""", """col_3""": """float32"""},
    ]    ,)
def 	SCREAMING_SNAKE_CASE_					(  _UpperCAmelCase	:	List[Any]    ,_UpperCAmelCase	:	Dict    ,_UpperCAmelCase	:	Optional[Any]    ,_UpperCAmelCase	:	int  )  ->			List[Any]:
       _a    : Union[str, Any]     					=tmp_path / """cache"""
       _a    : str     					={"""col_1""": """string""", """col_2""": """int64""", """col_3""": """float64"""}
       _a    : Optional[int]     					=features.copy() if features else default_expected_features
       _a    : Union[str, Any]     					=(
           Features({feature: Value(_UpperCAmelCase  ) for feature, dtype in features.items()}  ) if features is not None else None
       )
       _a    : Optional[Any]     					=SqlDatasetReader("""dataset"""    ,"""sqlite:///""" + sqlite_path    ,features=_UpperCAmelCase    ,cache_dir=_UpperCAmelCase  ).read()
       _check_sql_dataset(_UpperCAmelCase    ,_UpperCAmelCase  )


def 	SCREAMING_SNAKE_CASE_					(  _UpperCAmelCase	:	Optional[Any]  )  ->			List[str]:
       with contextlib.closing(sqlitea.connect(_UpperCAmelCase  )  ) as con:
              _a    : Any     					=con.cursor()
              cur.execute("""SELECT * FROM dataset"""  )
              for row in cur:
                     yield row


@require_sqlalchemy
def 	SCREAMING_SNAKE_CASE_					(  _UpperCAmelCase	:	Dict    ,_UpperCAmelCase	:	Tuple    ,_UpperCAmelCase	:	List[str]  )  ->			Union[str, Any]:
       _a    : Union[str, Any]     					=tmp_path / """cache"""
       _a    : Union[str, Any]     					=os.path.join(_UpperCAmelCase    ,"""tmp.sql"""  )
       _a    : Tuple     					=SqlDatasetReader("""dataset"""    ,"""sqlite:///""" + sqlite_path    ,cache_dir=_UpperCAmelCase  ).read()
       SqlDatasetWriter(_UpperCAmelCase    ,"""dataset"""    ,"""sqlite:///""" + output_sqlite_path    ,num_proc=1  ).write()

       _a    : Tuple     					=iter_sql_file(_UpperCAmelCase  )
       _a    : List[Any]     					=iter_sql_file(_UpperCAmelCase  )

       for rowa, rowa in zip(_UpperCAmelCase    ,_UpperCAmelCase  ):
              assert rowa == rowa


@require_sqlalchemy
def 	SCREAMING_SNAKE_CASE_					(  _UpperCAmelCase	:	Optional[int]    ,_UpperCAmelCase	:	Any    ,_UpperCAmelCase	:	List[Any]  )  ->			Optional[int]:
       _a    : int     					=tmp_path / """cache"""
       _a    : Any     					=os.path.join(_UpperCAmelCase    ,"""tmp.sql"""  )
       _a    : Union[str, Any]     					=SqlDatasetReader("""dataset"""    ,"""sqlite:///""" + sqlite_path    ,cache_dir=_UpperCAmelCase  ).read()
       SqlDatasetWriter(_UpperCAmelCase    ,"""dataset"""    ,"""sqlite:///""" + output_sqlite_path    ,num_proc=2  ).write()

       _a    : List[Any]     					=iter_sql_file(_UpperCAmelCase  )
       _a    : str     					=iter_sql_file(_UpperCAmelCase  )

       for rowa, rowa in zip(_UpperCAmelCase    ,_UpperCAmelCase  ):
              assert rowa == rowa


@require_sqlalchemy
def 	SCREAMING_SNAKE_CASE_					(  _UpperCAmelCase	:	Union[str, Any]    ,_UpperCAmelCase	:	str    ,_UpperCAmelCase	:	List[Any]  )  ->			List[str]:
       _a    : List[str]     					=tmp_path / """cache"""
       _a    : Dict     					=os.path.join(_UpperCAmelCase    ,"""tmp.sql"""  )
       _a    : Optional[Any]     					=SqlDatasetReader("""dataset"""    ,"""sqlite:///""" + sqlite_path    ,cache_dir=_UpperCAmelCase  ).read()
       with pytest.raises(_UpperCAmelCase  ):
              SqlDatasetWriter(_UpperCAmelCase    ,"""dataset"""    ,"""sqlite:///""" + output_sqlite_path    ,num_proc=0  ).write()


