12

Aufgabe 11/Aufgabe11.py

@@ -1,366 +1,276 @@
-from __future__ import annotations
-
 from sparkstart import scon, spark
 from pyspark.sql import SparkSession
-
 import matplotlib.pyplot as plt
-
+import pandas as pd
 
 HDFSPATH = "hdfs://193.174.205.250:54310/"
+HDFSPATH_STOCKS = "hdfs://193.174.205.250:54310/stocks/"
 
-
+def read_parquets(spark: SparkSession):
-def read_parquet_tables(spark: SparkSession) -> None:
-	"""Load station master data and hourly measurements from parquet if needed."""
 	stations_path = HDFSPATH + "home/heiserervalentin/german_stations.parquet"
 	products_path = HDFSPATH + "home/heiserervalentin/german_stations_data.parquet"
 
 	stations_df = spark.read.parquet(stations_path)
 	stations_df.createOrReplaceTempView("german_stations")
-	stations_df.cache()
 
 	products_df = spark.read.parquet(products_path)
 	products_df.createOrReplaceTempView("german_stations_data")
+
+	stations_df.cache()
 	products_df.cache()
 
+def task_11a_rollup(spark: SparkSession, station_name="Kempten"):
+    print(f"\n--- Aufgabe 11a: Rollup & Plotting für {station_name} ---")
+    start_time = time.time()
 
-def _escape_like(value: str) -> str:
+    # 1. Station ID finden
-	"""Escape single quotes for safe SQL literal usage."""
+    # Case-insensitive search
-	return value.replace("'", "''")
+    sid_df = spark.sql(f"SELECT stationId FROM german_stations WHERE lower(station_name) LIKE '%{station_name.lower()}%'")
+    try:
+        sid = sid_df.collect()[0]['stationId']
+        print(f"Station found: {station_name} -> ID {sid}")
+    except IndexError:
+        print(f"Station {station_name} nicht gefunden.")
+        return
+
+    # 2. Rollup Query vorbereiten
+    # FIX: Parse string date 'YYYYMMDD' to real DATE object first
+    q_prep = f"""
+        SELECT 
+            YEAR(TO_DATE(date, 'yyyyMMdd')) as yr, 
+            QUARTER(TO_DATE(date, 'yyyyMMdd')) as qt, 
+            MONTH(TO_DATE(date, 'yyyyMMdd')) as mo, 
+            DAY(TO_DATE(date, 'yyyyMMdd')) as da,
+            TT_TU 
+        FROM german_stations_data 
+        WHERE stationId = {sid} 
+          AND TT_TU IS NOT NULL 
+          AND TT_TU > -50 
+          AND TT_TU < 60
+    """
+    spark.sql(q_prep).createOrReplaceTempView("data_prep")
+    
+    # 3. Rollup Execution
+    # Note: We use string construction for quarters/months to ensure we get a valid date string for plotting
+    q_rollup = """
+        SELECT 
+            yr, qt, mo, da,
+            MIN(TT_TU) as min_temp,
+            MAX(TT_TU) as max_temp,
+            AVG(TT_TU) as avg_temp,
+            
+            -- Construct dates for plotting (handling the NULLs from ROLLUP)
+            -- For Quarter: Use 1st month of quarter
+            DATE(concat_ws('-', yr, cast(qt*3-2 as int), '01')) as qt_date,
+            -- For Month: Use 1st day of month
+            MAKE_DATE(yr, mo, 1) as mo_date,
+            -- For Year: Use Jan 1st
+            MAKE_DATE(yr, 1, 1) as yr_date,
+            -- For Day: Use actual date
+            MAKE_DATE(yr, mo, da) as da_date
+            
+        FROM data_prep
+        GROUP BY ROLLUP(yr, qt, mo, da)
+    """
+    
+    df_rollup = spark.sql(q_rollup)
+    df_rollup.cache()
+    df_rollup.createOrReplaceTempView("station_rollup")
+    
+    # Trigger Action
+    count = df_rollup.count()
+    print(f"Rollup berechnet. Zeilen: {count}. Dauer: {time.time() - start_time:.2f}s")
+
+    # --- PLOTTING ---
+
+    # Plot 1: Tageswerte (letzte 3 Jahre)
+    # Filter: All levels must be present (not null)
+    q_days = """
+        SELECT da_date as date, avg_temp 
+        FROM station_rollup 
+        WHERE yr IS NOT NULL AND qt IS NOT NULL AND mo IS NOT NULL AND da IS NOT NULL
+        AND yr >= (SELECT MAX(yr) - 2 FROM station_rollup WHERE yr IS NOT NULL)
+        ORDER BY date
+    """
+    pdf_days = spark.sql(q_days).toPandas()
+    
+    if pdf_days.empty:
+        print("Warnung: Keine Daten für Tages-Plot gefunden.")
+    else:
+        plt.figure(1, figsize=(10, 5))
+        plt.plot(pdf_days['date'], pdf_days['avg_temp'], label='Daily Avg', linewidth=0.5)
+        plt.title(f"{station_name}: Daily Average (Last 3 Years)")
+        plt.xlabel('Date')
+        plt.ylabel('Temp °C')
+        plt.tight_layout()
+        plt.show()
+
+    # Plot 2: Monatswerte (10-20 Jahre)
+    # Filter: Day is NULL (aggregation level), but Month is NOT NULL
+    q_months = """
+        SELECT mo_date as date, avg_temp 
+        FROM station_rollup 
+        WHERE yr IS NOT NULL AND qt IS NOT NULL AND mo IS NOT NULL AND da IS NULL
+        AND yr >= (SELECT MAX(yr) - 20 FROM station_rollup WHERE yr IS NOT NULL)
+        ORDER BY date
+    """
+    pdf_months = spark.sql(q_months).toPandas()
+
+    if not pdf_months.empty:
+        plt.figure(2, figsize=(10, 5))
+        plt.plot(pdf_months['date'], pdf_months['avg_temp'], color='green', label='Monthly Avg')
+        plt.title(f"{station_name}: Monthly Average (Last 20 Years)")
+        plt.xlabel('Date')
+        plt.ylabel('Temp °C')
+        plt.tight_layout()
+        plt.show()
+
+    # Plot 3: Quartalswerte
+    # Filter: Month is NULL, Quarter is NOT NULL
+    q_quarters = """
+        SELECT qt_date as date, avg_temp 
+        FROM station_rollup 
+        WHERE yr IS NOT NULL AND qt IS NOT NULL AND mo IS NULL AND da IS NULL
+        AND yr >= (SELECT MAX(yr) - 20 FROM station_rollup WHERE yr IS NOT NULL)
+        ORDER BY date
+    """
+    pdf_quarters = spark.sql(q_quarters).toPandas()
+    
+    if not pdf_quarters.empty:
+        plt.figure(3, figsize=(10, 5))
+        plt.plot(pdf_quarters['date'], pdf_quarters['avg_temp'], color='orange', marker='o', linestyle='-', label='Quarterly Avg')
+        plt.title(f"{station_name}: Quarterly Average (Last 20 Years)")
+        plt.tight_layout()
+        plt.show()
+
+    # Plot 4: Jahreswerte
+    # Filter: Quarter is NULL, Year is NOT NULL
+    q_years = """
+        SELECT yr_date as date, min_temp, max_temp, avg_temp 
+        FROM station_rollup 
+        WHERE yr IS NOT NULL AND qt IS NULL AND mo IS NULL AND da IS NULL
+        AND yr >= (SELECT MAX(yr) - 20 FROM station_rollup WHERE yr IS NOT NULL)
+        ORDER BY date
+    """
+    pdf_years = spark.sql(q_years).toPandas()
+    
+    if not pdf_years.empty:
+        plt.figure(4, figsize=(10, 5))
+        plt.plot(pdf_years['date'], pdf_years['max_temp'], color='red', label='Max')
+        plt.plot(pdf_years['date'], pdf_years['avg_temp'], color='black', label='Avg')
+        plt.plot(pdf_years['date'], pdf_years['min_temp'], color='blue', label='Min')
+        plt.title(f"{station_name}: Yearly Aggregates (Last 20 Years)")
+        plt.legend()
+        plt.tight_layout()
+        plt.show()
 
 
-def resolve_station_id(spark: SparkSession, station_identifier) -> int:
+def task_11b_rank(spark: SparkSession):
-	"""Resolve station id either from int input or fuzzy name search."""
+    print("\n--- Aufgabe 11b: TempMonat Ranking ---")
-	if isinstance(station_identifier, int):
-		return station_identifier
-	if isinstance(station_identifier, str) and station_identifier.strip().isdigit():
-		return int(station_identifier.strip())
-	if isinstance(station_identifier, str):
-		needle = _escape_like(station_identifier.lower())
-		q = (
-			"SELECT stationId FROM german_stations "
-			f"WHERE lower(station_name) LIKE '%{needle}%' ORDER BY station_name LIMIT 1"
-		)
-		result = spark.sql(q).collect()
-		if not result:
-			raise ValueError(f"No station found for pattern '{station_identifier}'")
-		return int(result[0]["stationId"])
-	raise ValueError("station_identifier must be int or str")
     
 
-def build_station_rollup_for_station(spark: SparkSession, station_identifier) -> None:
+    q_tempmonat = """
-	"""Create rollup view with min/max/avg per hour/day/month/quarter/year."""
+        SELECT 
-	station_id = resolve_station_id(spark, station_identifier)
+            d.stationId, 
-	q = f"""
+            s.station_name,
-	WITH base AS (
+            SUBSTR(CAST(d.date AS STRING), 1, 4) as year,
-		SELECT
+            SUBSTR(CAST(d.date AS STRING), 6, 2) as month,
-			d.stationId,
+            MIN(d.TT_TU) as min_t,
-			gs.station_name,
+            MAX(d.TT_TU) as max_t,
-			TO_TIMESTAMP(CONCAT(d.date, LPAD(CAST(d.hour AS STRING), 2, '0')), 'yyyyMMddHH') AS hour_ts,
+            AVG(d.TT_TU) as avg_t
-			TO_DATE(d.date, 'yyyyMMdd') AS day_date,
+        FROM german_stations_data d
-			MONTH(TO_DATE(d.date, 'yyyyMMdd')) AS month_in_year,
+        JOIN german_stations s ON d.stationId = s.stationId
-			QUARTER(TO_DATE(d.date, 'yyyyMMdd')) AS quarter_in_year,
+        WHERE d.TT_TU IS NOT NULL AND d.TT_TU > -50
-			YEAR(TO_DATE(d.date, 'yyyyMMdd')) AS year_value,
+        GROUP BY d.stationId, s.station_name, year, month
-			d.TT_TU AS temperature
+    """
-		FROM german_stations_data d
+    df_tm = spark.sql(q_tempmonat)
-		JOIN german_stations gs ON d.stationId = gs.stationId
+    df_tm.createOrReplaceTempView("tempmonat")
-		WHERE d.stationId = {station_id}
+    
-			AND d.TT_TU IS NOT NULL
+    # 1. Ranking Partitioniert nach Monat im Jahr 2015
-			AND d.TT_TU <> -999
+    print("  > Berechne Ranking für 2015 (partitioniert nach Monat)...")
-	),
+    q_rank_2015 = """
-	rollup_base AS (
+        SELECT 
-		SELECT
+            month, station_name, min_t,
-			stationId,
+            RANK() OVER (PARTITION BY month ORDER BY min_t ASC) as rank_min,
-			station_name,
+            RANK() OVER (PARTITION BY month ORDER BY max_t ASC) as rank_max,
-			hour_ts,
+            RANK() OVER (PARTITION BY month ORDER BY avg_t ASC) as rank_avg
-			day_date,
+        FROM tempmonat
-			month_in_year,
+        WHERE year = '2015'
-			quarter_in_year,
+        ORDER BY rank_min, month
-			year_value,
+    """
-			MIN(temperature) AS min_temp,
+    spark.sql(q_rank_2015).show(10)
-			MAX(temperature) AS max_temp,
+
-			AVG(temperature) AS avg_temp
+    # 2. Globales Ranking (über alle Monate/Jahre hinweg)
-		FROM base
+    print("  > Berechne Ranking global (kälteste Monate aller Zeiten)...")
-		GROUP BY stationId, station_name, ROLLUP(year_value, quarter_in_year, month_in_year, day_date, hour_ts)
+    q_rank_global = """
-	)
+        SELECT 
-	SELECT
+            year, month, station_name, min_t,
-		stationId,
+            RANK() OVER (ORDER BY min_t ASC) as rank_min,
-		station_name,
+            RANK() OVER (ORDER BY max_t ASC) as rank_max,
-		hour_ts,
+            RANK() OVER (ORDER BY avg_t ASC) as rank_avg
-		day_date,
+        FROM tempmonat
-		month_in_year,
+        ORDER BY rank_min
-		quarter_in_year,
+    """
-		year_value,
+    spark.sql(q_rank_global).show(10)
-		CASE WHEN month_in_year IS NOT NULL THEN TO_DATE(CONCAT(CAST(year_value AS STRING), '-', LPAD(CAST(month_in_year AS STRING), 2, '0'), '-01')) END AS month_start_date,
+    
-		CASE WHEN quarter_in_year IS NOT NULL THEN TO_DATE(CONCAT(CAST(year_value AS STRING), '-', LPAD(CAST(quarter_in_year * 3 - 2 AS STRING), 2, '0'), '-01')) END AS quarter_start_date,
+    print("11b: Fertig.")
-		CASE WHEN year_value IS NOT NULL THEN TO_DATE(CONCAT(CAST(year_value AS STRING), '-01-01')) END AS year_start_date,
-		min_temp,
-		max_temp,
-		avg_temp
-	FROM rollup_base
-	"""
-	rollup_df = spark.sql(q)
-	rollup_df.cache()
-	rollup_df.createOrReplaceTempView("station_rollup")
 
 
-def _year_window(spark: SparkSession, years_back: int, station_id: int) -> tuple[int, int] | None:
+def task_11c_groupingsets(spark: SparkSession):
-	stats = spark.sql(
+    print("\n--- Aufgabe 11c: Grouping Sets ---")
-		f"SELECT MIN(year_value) AS min_year, MAX(year_value) AS max_year FROM station_rollup WHERE year_value IS NOT NULL AND stationId = {station_id}"
-	).collect()
-	if not stats or stats[0]["max_year"] is None:
-		return None
-	min_year = int(stats[0]["min_year"])
-	max_year = int(stats[0]["max_year"])
-	start_year = max(min_year, max_year - years_back + 1)
-	return start_year, max_year
     
 
-def plot_station_rollup_levels(
+    q_prep = """
-	spark: SparkSession,
+        SELECT 
-	station_identifier,
+            CAST(SUBSTR(CAST(d.date AS STRING), 1, 4) AS INT) as year,
-	day_span_years: int = 3,
+            CAST(SUBSTR(CAST(d.date AS STRING), 6, 2) AS INT) as month,
-	agg_span_years: int = 15,
+            s.station_name,
-) -> None:
+            s.bundesland,
-	"""Plot day, month, quarter, and year aggregates for the given station."""
+            d.TT_TU
-	station_id = resolve_station_id(spark, station_identifier)
+        FROM german_stations_data d
-	needs_refresh = not spark.catalog.tableExists("station_rollup")
+        JOIN german_stations s ON d.stationId = s.stationId
-	if not needs_refresh:
+        WHERE d.TT_TU > -50
-		count = spark.sql(
+    """
-			f"SELECT COUNT(*) AS cnt FROM station_rollup WHERE stationId = {station_id}"
+    spark.sql(q_prep).createOrReplaceTempView("gs_base")
-		).collect()[0]["cnt"]
-		needs_refresh = count == 0
-	if needs_refresh:
-		build_station_rollup_for_station(spark, station_id)
 
-	day_window = _year_window(spark, day_span_years, station_id)
+    q_sets = """
-	if day_window is None:
+        SELECT 
-		print("No data available for plotting")
+            year, 
-		return
+            month, 
-	month_window = _year_window(spark, agg_span_years, station_id)
+            bundesland, 
-	if month_window is None:
+            station_name,
-		print("No aggregated window available")
+            MIN(TT_TU) as min_t, MAX(TT_TU) as max_t, AVG(TT_TU) as avg_t
-		return
+        FROM gs_base
+        GROUP BY GROUPING SETS (
+            (year, bundesland),
+            (year, station_name),
+            (month, bundesland)
+        )
+    """
+    df_gs = spark.sql(q_sets)
+    df_gs.cache()
+    df_gs.createOrReplaceTempView("grouping_result")
     
-	def _plot(query: str, figure_idx: int, title: str, x_col: str = "bucket_date") -> None:
+    # Action zum Cachen
-		pdf = spark.sql(query).toPandas()
+    df_gs.count()
-		if pdf.empty:
+    print("Grouping Sets berechnet.")
-			print(f"No data for {title}")
-			return
-		plt.figure(num=figure_idx)
-		plt.clf()
-		metrics = [
-			("min_temp", "Min", "#1f77b4"),
-			("avg_temp", "Avg", "#ff7f0e"),
-			("max_temp", "Max", "#2ca02c"),
-		]
-		for col, label, color in metrics:
-			if col in pdf:
-				plt.plot(pdf[x_col], pdf[col], label=label, color=color)
-		plt.title(title)
-		plt.xlabel("Datum")
-		plt.ylabel("Temperatur (°C)")
-		plt.legend()
-		plt.tight_layout()
-		plt.show()
 
-	day_start, day_end = day_window
+    print("Auswahl 1: Jahr & Bundesland")
-	q_day = f"""
+    spark.sql("SELECT year, bundesland, avg_t FROM grouping_result WHERE station_name IS NULL AND month IS NULL ORDER BY year DESC, bundesland").show(5)
-	SELECT day_date AS bucket_date, min_temp, avg_temp, max_temp
-	FROM station_rollup
-	WHERE stationId = {station_id}
-		AND hour_ts IS NULL
-		AND day_date IS NOT NULL
-		AND year_value BETWEEN {day_start} AND {day_end}
-	ORDER BY bucket_date
-	"""
-	_plot(q_day, 1, f"Tagesmittelwerte {day_start}-{day_end}")
 
-	agg_start, agg_end = month_window
+    print("Auswahl 2: Jahr & Station")
-	q_month = f"""
+    spark.sql("SELECT year, station_name, avg_t FROM grouping_result WHERE bundesland IS NULL AND month IS NULL ORDER BY year DESC, station_name").show(5)
-	SELECT month_start_date AS bucket_date, min_temp, avg_temp, max_temp
-	FROM station_rollup
-	WHERE stationId = {station_id}
-		AND day_date IS NULL
-		AND month_in_year IS NOT NULL
-		AND year_value BETWEEN {agg_start} AND {agg_end}
-	ORDER BY bucket_date
-	"""
-	_plot(q_month, 2, f"Monatsmittelwerte {agg_start}-{agg_end}")
-
-	q_quarter = f"""
-	SELECT quarter_start_date AS bucket_date, min_temp, avg_temp, max_temp
-	FROM station_rollup
-	WHERE stationId = {station_id}
-		AND month_in_year IS NULL
-		AND quarter_in_year IS NOT NULL
-		AND year_value BETWEEN {agg_start} AND {agg_end}
-	ORDER BY bucket_date
-	"""
-	_plot(q_quarter, 3, f"Quartalsmittelwerte {agg_start}-{agg_end}")
-
-	q_year = f"""
-	SELECT year_start_date AS bucket_date, min_temp, avg_temp, max_temp
-	FROM station_rollup
-	WHERE stationId = {station_id}
-		AND quarter_in_year IS NULL
-		AND year_value IS NOT NULL
-	ORDER BY bucket_date
-	"""
-	_plot(q_year, 4, "Jahresmittelwerte")
-
-
-def create_tempmonat(spark: SparkSession) -> None:
-	"""Create cached temp table tempmonat with monthly aggregates per station."""
-	q = """
-	SELECT
-		d.stationId,
-		gs.station_name,
-		YEAR(TO_DATE(d.date, 'yyyyMMdd')) AS year_value,
-		MONTH(TO_DATE(d.date, 'yyyyMMdd')) AS month_value,
-		MIN(d.TT_TU) AS min_temp,
-		MAX(d.TT_TU) AS max_temp,
-		AVG(d.TT_TU) AS avg_temp
-	FROM german_stations_data d
-	JOIN german_stations gs ON d.stationId = gs.stationId
-	WHERE d.TT_TU IS NOT NULL AND d.TT_TU <> -999
-	GROUP BY d.stationId, gs.station_name, YEAR(TO_DATE(d.date, 'yyyyMMdd')), MONTH(TO_DATE(d.date, 'yyyyMMdd'))
-	"""
-	monthly_df = spark.sql(q)
-	monthly_df.cache()
-	monthly_df.createOrReplaceTempView("tempmonat")
-
-
-def rank_coldest_per_month_2015(spark: SparkSession):
-	"""Rank stations by coldest values per month for 2015 using tempmonat."""
-	return spark.sql(
-		"""
-		SELECT
-			stationId,
-			station_name,
-			year_value,
-			month_value,
-			min_temp,
-			max_temp,
-			avg_temp,
-			RANK() OVER (PARTITION BY month_value ORDER BY min_temp ASC) AS rank_min,
-			RANK() OVER (PARTITION BY month_value ORDER BY max_temp ASC) AS rank_max,
-			RANK() OVER (PARTITION BY month_value ORDER BY avg_temp ASC) AS rank_avg
-		FROM tempmonat
-		WHERE year_value = 2015
-		ORDER BY rank_min, month_value
-		"""
-	)
-
-
-def rank_coldest_overall(spark: SparkSession):
-	"""Rank stations by coldest values over all months/years (no partition)."""
-	return spark.sql(
-		"""
-		SELECT
-			stationId,
-			station_name,
-			year_value,
-			month_value,
-			min_temp,
-			max_temp,
-			avg_temp,
-			RANK() OVER (ORDER BY min_temp ASC) AS rank_min,
-			RANK() OVER (ORDER BY max_temp ASC) AS rank_max,
-			RANK() OVER (ORDER BY avg_temp ASC) AS rank_avg
-		FROM tempmonat
-		ORDER BY rank_min
-		"""
-	)
-
-
-def create_grouping_sets_overview(spark: SparkSession) -> None:
-	"""Compute grouping sets for requested aggregations and cache the result."""
-	q = """
-	WITH base AS (
-		SELECT
-			YEAR(TO_DATE(d.date, 'yyyyMMdd')) AS year_value,
-			MONTH(TO_DATE(d.date, 'yyyyMMdd')) AS month_value,
-			gs.bundesland,
-			gs.stationId,
-			gs.station_name,
-			d.TT_TU AS temperature
-		FROM german_stations_data d
-		JOIN german_stations gs ON d.stationId = gs.stationId
-		WHERE d.TT_TU IS NOT NULL AND d.TT_TU <> -999
-	)
-	SELECT
-		year_value,
-		month_value,
-		bundesland,
-		stationId,
-		station_name,
-		MIN(temperature) AS min_temp,
-		MAX(temperature) AS max_temp,
-		AVG(temperature) AS avg_temp
-	FROM base
-	GROUP BY GROUPING SETS (
-		(year_value, bundesland),
-		(year_value, stationId, station_name, bundesland),
-		(month_value, bundesland)
-	)
-	"""
-	grouped_df = spark.sql(q)
-	grouped_df.cache()
-	grouped_df.createOrReplaceTempView("grouping_sets_stats")
-
-
-def select_year_bundesland(spark: SparkSession):
-	return spark.sql(
-		"""
-		SELECT year_value, bundesland, min_temp, max_temp, avg_temp
-		FROM grouping_sets_stats
-		WHERE bundesland IS NOT NULL AND month_value IS NULL AND stationId IS NULL
-		ORDER BY year_value, bundesland
-		"""
-	)
-
-
-def select_year_station(spark: SparkSession):
-	return spark.sql(
-		"""
-		SELECT year_value, stationId, station_name, min_temp, max_temp, avg_temp
-		FROM grouping_sets_stats
-		WHERE stationId IS NOT NULL AND month_value IS NULL
-		ORDER BY year_value, stationId
-		"""
-	)
-
-
-def select_month_bundesland(spark: SparkSession):
-	return spark.sql(
-		"""
-		SELECT month_value, bundesland, min_temp, max_temp, avg_temp
-		FROM grouping_sets_stats
-		WHERE month_value IS NOT NULL AND year_value IS NULL
-		ORDER BY month_value, bundesland
-		"""
-	)
 
+    print("Auswahl 3: Monat & Bundesland (Jahreszeitlicher Verlauf je Land)")
+    spark.sql("SELECT month, bundesland, avg_t FROM grouping_result WHERE year IS NULL AND station_name IS NULL ORDER BY bundesland, month").show(5)
 
 def main(scon, spark):
-	read_parquet_tables(spark)
+    read_parquets(spark)
-	build_station_rollup_for_station(spark, "kempten")
-	plot_station_rollup_levels(spark, "kempten")
     
-	create_tempmonat(spark)
+    # Aufgabe 11
-	print("Rangfolgen 2015 je Monat:")
+    task_11a_rollup(spark, station_name="Kempten")
-	rank_coldest_per_month_2015(spark).show(36, truncate=False)
+    task_11b_rank(spark)
-	print("Rangfolgen gesamt:")
+    task_11c_groupingsets(spark)
-	rank_coldest_overall(spark).show(36, truncate=False)
 
-	create_grouping_sets_overview(spark)
+if __name__ == '__main__':
-	print("Jahr vs Bundesland:")
+    main(scon, spark)
-	select_year_bundesland(spark).show(20, truncate=False)
-	print("Jahr vs Station:")
-	select_year_station(spark).show(20, truncate=False)
-	print("Monat vs Bundesland:")
-	select_month_bundesland(spark).show(20, truncate=False)
-
-
-if __name__ == "__main__":
-	main(scon, spark)

Aufgabe 12/Aufgabe12.py

@@ -1,276 +1,123 @@
-from __future__ import annotations
-
-from typing import Iterable, Sequence
-
-from pyspark.sql import SparkSession, functions as F, types as T
-
 from sparkstart import scon, spark
+from pyspark.sql import SparkSession
+import time
+import matplotlib.pyplot as plt
+import pandas as pd
 
+HDFSPATH_STATIONS = "hdfs://193.174.205.250:54310/home/heiserervalentin/"
+HDFSPATH_STOCKS = "hdfs://193.174.205.250:54310/stocks/"
 
-HDFSPATH = "hdfs://193.174.205.250:54310/"
+def init_view_stocks(spark):
+    """Lädt die Stocks-Daten für Aufgabe 12"""
+    # Hinweis: Pfade anpassen, falls sie im Cluster anders liegen
+    spark.read.parquet(HDFSPATH_STOCKS + "stocks.parquet").createOrReplaceTempView("stocks")
+    spark.read.parquet(HDFSPATH_STOCKS + "portfolio.parquet").createOrReplaceTempView("portfolio")
 
+# ---------------------------------------------------------
+# AUFGABE 12
+# ---------------------------------------------------------
 
-_DATE_FALLBACK_EXPR = "COALESCE(date_value, TO_DATE(date_str), TO_DATE(date_str, 'yyyyMMdd'))"
+def task_12_stocks_analysis(spark: SparkSession):
+    print("\n--- Aufgabe 12: Stocks & Portfolio ---")
     
+    # a) Erstes und letztes Datum je Symbol
+    print("a) Min/Max Datum pro Symbol")
+    t0 = time.time()
+    q_a = """
+        SELECT symbol, MIN(date) as first_date, MAX(date) as last_date
+        FROM stocks
+        GROUP BY symbol
+        ORDER BY symbol
+    """
+    spark.sql(q_a).show(5)
+    print(f"Zeit a): {time.time()-t0:.2f}s")
 
-def _resolve_column_name(columns: Sequence[str], candidates: Iterable[str]) -> str:
+    # b) Aggregationen 2009
+    print("\nb) High/Low/Avg Close 2009")
+    t0 = time.time()
+    q_b = """
+        SELECT symbol, MAX(close) as max_close, MIN(close) as min_close, AVG(close) as avg_close
+        FROM stocks
+        WHERE YEAR(date) = 2009
+        GROUP BY symbol
+        ORDER BY symbol
+    """
+    spark.sql(q_b).show(5)
+    print(f"Zeit b): {time.time()-t0:.2f}s")
 
-	lowered = {col.lower(): col for col in columns}
+    # c) Lateral View (Explode Portfolio)
-	for candidate in candidates:
+    print("\nc) Lateral View: Aktien in Portfolios")
-		match = lowered.get(candidate.lower())
+    t0 = time.time()
-		if match:
-			return match
-	raise ValueError(f"None of the candidate columns {list(candidates)} exist in {columns}")
     
+    q_c = """
+        SELECT 
+            h.symbol,
+            SUM(h.amount) as total_shares,
+            COUNT(p.portfolioId) as num_portfolios,
+            AVG(h.amount) as avg_per_portfolio
+        FROM portfolio p
+        LATERAL VIEW explode(holdings) t AS h
+        GROUP BY h.symbol
+        ORDER BY h.symbol
+    """
+    spark.sql(q_c).show(5)
+    print(f"Zeit c): {time.time()-t0:.2f}s")
 
-def _normalize_stocks_view(spark: SparkSession) -> None:
+    # d) Symbole in keinem Portfolio (Anti Join)
+    print("\nd) Symbole ohne Portfolio")
+    t0 = time.time()
+    q_d = """
+        SELECT DISTINCT s.symbol
+        FROM stocks s
+        LEFT ANTI JOIN (
+            SELECT DISTINCT h.symbol 
+            FROM portfolio p 
+            LATERAL VIEW explode(holdings) t AS h
+        ) p_sym ON s.symbol = p_sym.symbol
+        ORDER BY s.symbol
+    """
+    spark.sql(q_d).show(5)
+    print(f"Zeit d): {time.time()-t0:.2f}s")
     
-	stocks_path = HDFSPATH + "stocks/stocks.parquet"
+    input(">> 12 a-d fertig. Check UI. Enter für e)...")
-	stocks_df = spark.read.parquet(stocks_path)
 
-	symbol_col = _resolve_column_name(stocks_df.columns, ("symbol", "ticker"))
+    # e) Portfolio Wert Ende 2010
-	date_col = _resolve_column_name(stocks_df.columns, ("date", "pricedate", "dt"))
+    print("\ne) Portfolio Bewertung Ende 2010")
-	close_col = _resolve_column_name(stocks_df.columns, ("close", "closeprice", "closingprice"))
+    t0 = time.time()
     
-	stocks_df = (
+    q_last_price = """
-		stocks_df
+        SELECT symbol, close
-		.select(
+        FROM (
-			F.col(symbol_col).alias("symbol"),
+            SELECT 
-			F.col(date_col).alias("raw_date"),
+                symbol, 
-			F.col(close_col).alias("close_raw"),
+                close, 
-		)
+                ROW_NUMBER() OVER (PARTITION BY symbol ORDER BY date DESC) as rn
-		.withColumn("date_str", F.col("raw_date").cast("string"))
+            FROM stocks
-	)
+            WHERE YEAR(date) = 2010
+        ) tmp
+        WHERE rn = 1
+    """
+    spark.sql(q_last_price).createOrReplaceTempView("stocks_2010_end")
 
-	date_candidates = [
+    # Schritt 2: Portfolio explodieren, mit Preis joinen, berechnen, summieren
-		F.col("raw_date").cast("date"),
+    q_val = """
-		F.to_date("raw_date"),
+        SELECT 
-		F.to_date("date_str"),
+            p.portfolioId,
-		F.to_date("date_str", "yyyyMMdd"),
+            SUM(h.amount * s.close) as portfolio_value_2010
-		F.to_date("date_str", "MM/dd/yyyy"),
+        FROM portfolio p
-	]
+        LATERAL VIEW explode(holdings) t AS h
-
+        JOIN stocks_2010_end s ON h.symbol = s.symbol
-	stocks_df = (
+        GROUP BY p.portfolioId
-		stocks_df
+        ORDER BY p.portfolioId
-		.withColumn("date_value", F.coalesce(*date_candidates))
+    """
-		.withColumn("year_value", F.substring("date_str", 1, 4).cast("int"))
+    spark.sql(q_val).show(5)
-		.withColumn("close_value", F.col("close_raw").cast("double"))
+    print(f"Zeit e): {time.time()-t0:.2f}s")
-		.select("symbol", "date_value", "date_str", "year_value", "close_value")
-	)
-
-	stocks_df.cache()
-	stocks_df.createOrReplaceTempView("stocks_enriched")
-
-
-def _pick_first_numeric_field(fields: Sequence[T.StructField]) -> str:
-
-	numeric_types = (
-		T.ByteType,
-		T.ShortType,
-		T.IntegerType,
-		T.LongType,
-		T.FloatType,
-		T.DoubleType,
-		T.DecimalType,
-	)
-	for field in fields:
-		if isinstance(field.dataType, numeric_types):
-			return field.name
-	raise ValueError("No numeric field found inside the holdings struct")
-
-
-def _resolve_portfolio_id_field(schema: T.StructType) -> str:
-
-	priority = ("portfolio_id", "portfolioid", "id")
-	lowered = {field.name.lower(): field.name for field in schema.fields}
-	for candidate in priority:
-		if candidate in lowered:
-			return lowered[candidate]
-
-	for field in schema.fields:
-		if not isinstance(field.dataType, (T.ArrayType, T.MapType)):
-			return field.name
-	raise ValueError("Portfolio schema does not contain a non-collection id column")
-
-
-def _normalize_holdings(df):
-
-	array_field = None
-	map_field = None
-	for field in df.schema.fields:
-		if isinstance(field.dataType, T.ArrayType) and isinstance(field.dataType.elementType, T.StructType):
-			array_field = field
-			break
-		if isinstance(field.dataType, T.MapType) and isinstance(field.dataType.keyType, T.StringType):
-			map_field = field
-
-	if array_field is not None:
-		struct_fields = array_field.dataType.elementType.fields
-		symbol_field = _resolve_column_name([f.name for f in struct_fields], ("symbol", "ticker"))
-		shares_field = _pick_first_numeric_field(struct_fields)
-		return F.expr(
-			f"transform(`{array_field.name}`, x -> named_struct('symbol', x.`{symbol_field}`, 'shares', CAST(x.`{shares_field}` AS DOUBLE)))"
-		)
-
-	if map_field is not None and isinstance(map_field.dataType.valueType, (T.IntegerType, T.LongType, T.FloatType, T.DoubleType, T.DecimalType)):
-		return F.expr(
-			f"transform(map_entries(`{map_field.name}`), x -> named_struct('symbol', x.key, 'shares', CAST(x.value AS DOUBLE)))"
-		)
-
-	raise ValueError("Could not locate holdings column (array<struct> or map) in portfolio data")
-
-
-def _normalize_portfolio_view(spark: SparkSession) -> None:
-
-	portfolio_path = HDFSPATH + "stocks/portfolio.parquet"
-	portfolio_df = spark.read.parquet(portfolio_path)
-
-	id_col = _resolve_portfolio_id_field(portfolio_df.schema)
-	holdings_expr = _normalize_holdings(portfolio_df)
-
-	normalized_df = (
-		portfolio_df
-		.select(
-			F.col(id_col).alias("portfolio_id"),
-			holdings_expr.alias("holdings"),
-		)
-	)
-
-	normalized_df.cache()
-	normalized_df.createOrReplaceTempView("portfolio")
-
-	spark.sql(
-		"""
-		CREATE OR REPLACE TEMP VIEW portfolio_positions AS
-		SELECT
-			portfolio_id,
-			pos.symbol AS symbol,
-			pos.shares AS shares
-		FROM portfolio
-		LATERAL VIEW explode(holdings) exploded AS pos
-		"""
-	)
-
-
-def register_base_views(spark: SparkSession) -> None:
-
-	_normalize_stocks_view(spark)
-	_normalize_portfolio_view(spark)
-
-
-def query_first_and_last_listing(spark: SparkSession):
-
-	q = f"""
-	SELECT
-		symbol,
-		MIN({_DATE_FALLBACK_EXPR}) AS first_listing,
-		MAX({_DATE_FALLBACK_EXPR}) AS last_listing
-	FROM stocks_enriched
-	WHERE symbol IS NOT NULL
-	GROUP BY symbol
-	ORDER BY symbol
-	"""
-	return spark.sql(q)
-
-
-def query_close_stats_2009(spark: SparkSession):
-
-	q = """
-	SELECT
-		symbol,
-		MAX(close_value) AS max_close,
-		MIN(close_value) AS min_close,
-		AVG(close_value) AS avg_close
-	FROM stocks_enriched
-	WHERE year_value = 2009 AND close_value IS NOT NULL AND symbol IS NOT NULL
-	GROUP BY symbol
-	ORDER BY symbol
-	"""
-	return spark.sql(q)
-
-
-def query_portfolio_symbol_stats(spark: SparkSession):
-
-	q = """
-	SELECT
-		symbol,
-		SUM(shares) AS total_shares,
-		COUNT(DISTINCT portfolio_id) AS portfolio_count,
-		AVG(shares) AS avg_shares_per_portfolio
-	FROM portfolio_positions
-	WHERE symbol IS NOT NULL
-	GROUP BY symbol
-	ORDER BY symbol
-	"""
-	return spark.sql(q)
-
-
-def query_symbols_missing_in_portfolios(spark: SparkSession):
-
-	q = """
-	SELECT DISTINCT s.symbol
-	FROM stocks_enriched s
-	LEFT ANTI JOIN (SELECT DISTINCT symbol FROM portfolio_positions WHERE symbol IS NOT NULL) p
-		ON s.symbol = p.symbol
-	WHERE s.symbol IS NOT NULL
-	ORDER BY s.symbol
-	"""
-	return spark.sql(q)
-
-
-def query_portfolio_values_2010(spark: SparkSession):
-
-	q = f"""
-	WITH quotes_2010 AS (
-		SELECT
-			symbol,
-			close_value,
-			ROW_NUMBER() OVER (
-				PARTITION BY symbol
-				ORDER BY {_DATE_FALLBACK_EXPR} DESC, date_str DESC
-			) AS rn
-		FROM stocks_enriched
-		WHERE year_value = 2010 AND symbol IS NOT NULL AND close_value IS NOT NULL
-	),
-	last_quotes AS (
-		SELECT symbol, close_value
-		FROM quotes_2010
-		WHERE rn = 1
-	),
-	portfolio_values AS (
-		SELECT
-			pp.portfolio_id,
-			SUM(pp.shares * lq.close_value) AS portfolio_value_2010
-		FROM portfolio_positions pp
-		JOIN last_quotes lq ON pp.symbol = lq.symbol
-		GROUP BY pp.portfolio_id
-	)
-	SELECT portfolio_id, portfolio_value_2010
-	FROM portfolio_values
-	ORDER BY portfolio_id
-	"""
-	return spark.sql(q)
 
 
 def main(scon, spark):
+    # Aufgabe 12
+    init_view_stocks(spark)
+    task_12_stocks_analysis(spark)
 
-	register_base_views(spark)
+if __name__ == '__main__':
-
+    main(scon, spark)
-	print("(a) Erste und letzte Notierung je Symbol:")
-	query_first_and_last_listing(spark).show(20, truncate=False)
-
-	print("(b) Schlusskurs-Statistiken 2009 je Symbol:")
-	query_close_stats_2009(spark).show(20, truncate=False)
-
-	print("(c) Portfolio-Kennzahlen je Symbol:")
-	query_portfolio_symbol_stats(spark).show(20, truncate=False)
-
-	print("(d) Symbole ohne Portfolio-Vorkommen:")
-	query_symbols_missing_in_portfolios(spark).show(20, truncate=False)
-
-	print("(e) Portfoliowerte Ende 2010:")
-	query_portfolio_values_2010(spark).show(20, truncate=False)
-
-
-if __name__ == "__main__":
-	main(scon, spark)