Add hive to superset + monkey patch the pyhive (apache#2134)

* Initial hive implementation

* Fix select star query for hive.

* Exclude generated code.

* Address code coverage and linting.

* Exclude generated code from coveralls.

* Fix lint errors

* Move TCLIService to it's own repo.

* Address comments

* Implement special postgres case,

superset/db_engine_specs.py

@@ -17,14 +17,19 @@
 from __future__ import unicode_literals
 
 from collections import namedtuple, defaultdict
-from flask_babel import lazy_gettext as _
 from superset import utils
 
 import inspect
+import re
+import sqlparse
 import textwrap
 import time
 
 from superset import cache_util
+from sqlalchemy import select
+from sqlalchemy.sql import text
+from superset.utils import SupersetTemplateException
+from flask_babel import lazy_gettext as _
 
 Grain = namedtuple('Grain', 'name label function')
 
@@ -37,9 +42,16 @@ class LimitMethod(object):
 
 class BaseEngineSpec(object):
     engine = 'base'  # str as defined in sqlalchemy.engine.engine
+    cursor_execute_kwargs = {}
     time_grains = tuple()
     limit_method = LimitMethod.FETCH_MANY
 
+    @classmethod
+    def fetch_data(cls, cursor, limit):
+        if cls.limit_method == LimitMethod.FETCH_MANY:
+            return cursor.fetchmany(limit)
+        return cursor.fetchall()
+
     @classmethod
     def epoch_to_dttm(cls):
         raise NotImplementedError()
@@ -106,6 +118,40 @@ def sql_preprocessor(cls, sql):
         """
         return sql
 
+    @classmethod
+    def patch(cls):
+        pass
+
+    @classmethod
+    def where_latest_partition(
+            cls, table_name, schema, database, qry, columns=None):
+        return False
+
+    @classmethod
+    def select_star(cls, my_db, table_name, schema=None, limit=100,
+                    show_cols=False, indent=True):
+        fields = '*'
+        table = my_db.get_table(table_name, schema=schema)
+        if show_cols:
+            fields = [my_db.get_quoter()(c.name) for c in table.columns]
+        full_table_name = table_name
+        if schema:
+            full_table_name = schema + '.' + table_name
+        qry = select(fields)
+        if limit:
+            qry = qry.limit(limit)
+        partition_query = cls.where_latest_partition(
+            table_name, schema, my_db, qry, columns=table.columns)
+        # if not partition_query condition fails.
+        if partition_query == False:  # noqa
+            qry = qry.select_from(text(full_table_name))
+        else:
+            qry = partition_query
+        sql = my_db.compile_sqla_query(qry)
+        if indent:
+            sql = sqlparse.format(sql, reindent=True)
+        return sql
+
 
 class PostgresEngineSpec(BaseEngineSpec):
     engine = 'postgresql'
@@ -122,6 +168,14 @@ class PostgresEngineSpec(BaseEngineSpec):
         Grain("year", _('year'), "DATE_TRUNC('year', {col})"),
     )
 
+    @classmethod
+    def fetch_data(cls, cursor, limit):
+        if not cursor.description:
+            return []
+        if cls.limit_method == LimitMethod.FETCH_MANY:
+            return cursor.fetchmany(limit)
+        return cursor.fetchall()
+
     @classmethod
     def epoch_to_dttm(cls):
         return "(timestamp 'epoch' + {col} * interval '1 second')"
@@ -235,27 +289,6 @@ def convert_dttm(cls, target_type, dttm):
     def epoch_to_dttm(cls):
         return "from_unixtime({col})"
 
-    @staticmethod
-    def show_partition_pql(
-            table_name, schema_name=None, order_by=None, limit=100):
-        if schema_name:
-            table_name = schema_name + '.' + table_name
-        order_by = order_by or []
-        order_by_clause = ''
-        if order_by:
-            order_by_clause = "ORDER BY " + ', '.join(order_by) + " DESC"
-
-        limit_clause = ''
-        if limit:
-            limit_clause = "LIMIT {}".format(limit)
-
-        return textwrap.dedent("""\
-        SHOW PARTITIONS
-        FROM {table_name}
-        {order_by_clause}
-        {limit_clause}
-        """).format(**locals())
-
     @classmethod
     @cache_util.memoized_func(
         timeout=600,
@@ -284,16 +317,14 @@ def extra_table_metadata(cls, database, table_name, schema_name):
         if not indexes:
             return {}
         cols = indexes[0].get('column_names', [])
-        pql = cls.show_partition_pql(table_name, schema_name, cols)
-        df = database.get_df(pql, schema_name)
-        latest_part = df.to_dict(orient='records')[0] if not df.empty else None
-
-        partition_query = cls.show_partition_pql(table_name, schema_name, cols)
+        pql = cls._partition_query(table_name, schema_name, cols)
+        col_name, latest_part = cls.latest_partition(
+            table_name, schema_name, database)
         return {
             'partitions': {
                 'cols': cols,
-                'latest': latest_part,
-                'partitionQuery': partition_query,
+                'latest': {col_name: latest_part},
+                'partitionQuery': pql,
             }
         }
 
@@ -332,6 +363,251 @@ def extract_error_message(cls, e):
             )
         return utils.error_msg_from_exception(e)
 
+    @classmethod
+    def _partition_query(
+            cls, table_name, limit=0, order_by=None, filters=None):
+        """Returns a partition query
+
+        :param table_name: the name of the table to get partitions from
+        :type table_name: str
+        :param limit: the number of partitions to be returned
+        :type limit: int
+        :param order_by: a list of tuples of field name and a boolean
+            that determines if that field should be sorted in descending
+            order
+        :type order_by: list of (str, bool) tuples
+        :param filters: a list of filters to apply
+        :param filters: dict of field name and filter value combinations
+        """
+        limit_clause = "LIMIT {}".format(limit) if limit else ''
+        order_by_clause = ''
+        if order_by:
+            l = []
+            for field, desc in order_by:
+                l.append(field + ' DESC' if desc else '')
+            order_by_clause = 'ORDER BY ' + ', '.join(l)
+
+        where_clause = ''
+        if filters:
+            l = []
+            for field, value in filters.items():
+                l.append("{field} = '{value}'".format(**locals()))
+            where_clause = 'WHERE ' + ' AND '.join(l)
+
+        sql = textwrap.dedent("""\
+            SHOW PARTITIONS FROM {table_name}
+            {where_clause}
+            {order_by_clause}
+            {limit_clause}
+        """).format(**locals())
+        return sql
+
+    @classmethod
+    def _latest_partition_from_df(cls, df):
+        return df.to_records(index=False)[0][0]
+
+    @classmethod
+    def latest_partition(cls, table_name, schema, database):
+        """Returns col name and the latest (max) partition value for a table
+
+        :param table_name: the name of the table
+        :type table_name: str
+        :param schema: schema / database / namespace
+        :type schema: str
+        :param database: database query will be run against
+        :type database: models.Database
+
+        >>> latest_partition('foo_table')
+        '2018-01-01'
+        """
+        indexes = database.get_indexes(table_name, schema)
+        if len(indexes[0]['column_names']) < 1:
+            raise SupersetTemplateException(
+                "The table should have one partitioned field")
+        elif len(indexes[0]['column_names']) > 1:
+            raise SupersetTemplateException(
+                "The table should have a single partitioned field "
+                "to use this function. You may want to use "
+                "`presto.latest_sub_partition`")
+        part_field = indexes[0]['column_names'][0]
+        sql = cls._partition_query(table_name, 1, [(part_field, True)])
+        df = database.get_df(sql, schema)
+        return part_field, cls._latest_partition_from_df(df)
+
+    @classmethod
+    def latest_sub_partition(cls, table_name, schema, database,  **kwargs):
+        """Returns the latest (max) partition value for a table
+
+        A filtering criteria should be passed for all fields that are
+        partitioned except for the field to be returned. For example,
+        if a table is partitioned by (``ds``, ``event_type`` and
+        ``event_category``) and you want the latest ``ds``, you'll want
+        to provide a filter as keyword arguments for both
+        ``event_type`` and ``event_category`` as in
+        ``latest_sub_partition('my_table',
+            event_category='page', event_type='click')``
+
+        :param table_name: the name of the table, can be just the table
+            name or a fully qualified table name as ``schema_name.table_name``
+        :type table_name: str
+        :param schema: schema / database / namespace
+        :type schema: str
+        :param database: database query will be run against
+        :type database: models.Database
+
+        :param kwargs: keyword arguments define the filtering criteria
+            on the partition list. There can be many of these.
+        :type kwargs: str
+        >>> latest_sub_partition('sub_partition_table', event_type='click')
+        '2018-01-01'
+        """
+        indexes = database.get_indexes(table_name, schema)
+        part_fields = indexes[0]['column_names']
+        for k in kwargs.keys():
+            if k not in k in part_fields:
+                msg = "Field [{k}] is not part of the portioning key"
+                raise SupersetTemplateException(msg)
+        if len(kwargs.keys()) != len(part_fields) - 1:
+            msg = (
+                "A filter needs to be specified for {} out of the "
+                "{} fields."
+            ).format(len(part_fields)-1, len(part_fields))
+            raise SupersetTemplateException(msg)
+
+        for field in part_fields:
+            if field not in kwargs.keys():
+                field_to_return = field
+
+        sql = cls._partition_query(
+            table_name, 1, [(field_to_return, True)], kwargs)
+        df = database.get_df(sql, schema)
+        if df.empty:
+            return ''
+        return df.to_dict()[field_to_return][0]
+
+
+class HiveEngineSpec(PrestoEngineSpec):
+
+    """Reuses PrestoEngineSpec functionality."""
+
+    engine = 'hive'
+    cursor_execute_kwargs = {'async': True}
+
+    @classmethod
+    def patch(cls):
+        from pyhive import hive
+        from superset.db_engines import hive as patched_hive
+        from pythrifthiveapi.TCLIService import (
+            constants as patched_constants,
+            ttypes as patched_ttypes,
+            TCLIService as patched_TCLIService)
+
+        hive.TCLIService = patched_TCLIService
+        hive.constants = patched_constants
+        hive.ttypes = patched_ttypes
+        hive.Cursor.fetch_logs = patched_hive.fetch_logs
+
+    @classmethod
+    @cache_util.memoized_func(
+        timeout=600,
+        key=lambda *args, **kwargs: 'db:{}:{}'.format(args[0].id, args[1]))
+    def fetch_result_sets(cls, db, datasource_type, force=False):
+        return BaseEngineSpec.fetch_result_sets(
+            db, datasource_type, force=force)
+
+    @classmethod
+    def progress(cls, logs):
+        # 17/02/07 19:36:38 INFO ql.Driver: Total jobs = 5
+        jobs_stats_r = re.compile(
+            r'.*INFO.*Total jobs = (?P<max_jobs>[0-9]+)')
+        # 17/02/07 19:37:08 INFO ql.Driver: Launching Job 2 out of 5
+        launching_job_r = re.compile(
+            '.*INFO.*Launching Job (?P<job_number>[0-9]+) out of '
+            '(?P<max_jobs>[0-9]+)')
+        # 17/02/07 19:36:58 INFO exec.Task: 2017-02-07 19:36:58,152 Stage-18
+        # map = 0%,  reduce = 0%
+        stage_progress = re.compile(
+            r'.*INFO.*Stage-(?P<stage_number>[0-9]+).*'
+            r'map = (?P<map_progress>[0-9]+)%.*'
+            r'reduce = (?P<reduce_progress>[0-9]+)%.*')
+        total_jobs = None
+        current_job = None
+        stages = {}
+        lines = logs.splitlines()
+        for line in lines:
+            match = jobs_stats_r.match(line)
+            if match:
+                total_jobs = int(match.groupdict()['max_jobs'])
+            match = launching_job_r.match(line)
+            if match:
+                current_job = int(match.groupdict()['job_number'])
+                stages = {}
+            match = stage_progress.match(line)
+            if match:
+                stage_number = int(match.groupdict()['stage_number'])
+                map_progress = int(match.groupdict()['map_progress'])
+                reduce_progress = int(match.groupdict()['reduce_progress'])
+                stages[stage_number] = (map_progress + reduce_progress) / 2
+
+        if not total_jobs or not current_job:
+            return 0
+        stage_progress = sum(
+            stages.values()) / len(stages.values()) if stages else 0
+
+        progress = (
+            100 * (current_job - 1) / total_jobs + stage_progress / total_jobs
+        )
+        return int(progress)
+
+    @classmethod
+    def handle_cursor(cls, cursor, query, session):
+        """Updates progress information"""
+        from pyhive import hive
+        print("PATCHED TCLIService {}".format(hive.TCLIService.__file__))
+        unfinished_states = (
+            hive.ttypes.TOperationState.INITIALIZED_STATE,
+            hive.ttypes.TOperationState.RUNNING_STATE,
+        )
+        polled = cursor.poll()
+        while polled.operationState in unfinished_states:
+            resp = cursor.fetch_logs()
+            if resp and resp.log:
+                progress = cls.progress(resp.log)
+                if progress > query.progress:
+                    query.progress = progress
+                session.commit()
+            time.sleep(5)
+            polled = cursor.poll()
+
+    @classmethod
+    def where_latest_partition(
+            cls, table_name, schema, database, qry, columns=None):
+        try:
+            col_name, value = cls.latest_partition(
+                table_name, schema, database)
+        except Exception:
+            # table is not partitioned
+            return False
+        for c in columns:
+            if str(c.name) == str(col_name):
+                return qry.where(c == str(value))
+        return False
+
+    @classmethod
+    def latest_sub_partition(cls, table_name, **kwargs):
+        # TODO(bogdan): implement`
+        pass
+
+    @classmethod
+    def _latest_partition_from_df(cls, df):
+        """Hive partitions look like ds={partition name}"""
+        return df.ix[:, 0].max().split('=')[1]
+
+    @classmethod
+    def _partition_query(
+            cls, table_name, limit=0, order_by=None, filters=None):
+        return "SHOW PARTITIONS {table_name}".format(**locals())
+
 
 class MssqlEngineSpec(BaseEngineSpec):
     engine = 'mssql'