source files only

2026-02-24 07:09:37 +03:00
commit 5da4df2f14
7 changed files with 381 additions and 0 deletions
--- a/create_marts_greenplum.py
+++ b/create_marts_greenplum.py
@@ -0,0 +1,83 @@
+import os
+from pyspark.sql import SparkSession
+from pyspark.sql import functions as F
+from pyspark.sql import DataFrame
+
+spark = SparkSession.builder \
+    .appName("create_marts_greenplum") \
+    .master("local[*]") \
+    .getOrCreate()
+
+def read_csv_folder(path: str) -> DataFrame:
+    return spark.read \
+        .option("header", "true") \
+        .option("inferSchema", "true") \
+        .csv(path)
+
+dim_user = read_csv_folder("data/greenplum/dim_user")
+dim_course = read_csv_folder("data/greenplum/dim_course")
+dim_lesson = read_csv_folder("data/greenplum/dim_lesson")
+fact_lesson_views = read_csv_folder("data/greenplum/fact_lesson_views")
+fact_enrollments = read_csv_folder("data/greenplum/fact_enrollments")
+
+lesson_popularity_summary = fact_lesson_views.alias("flv") \
+    .join(dim_lesson.alias("dl"), F.col("flv.lesson_id") == F.col("dl.lesson_id")) \
+    .join(dim_course.alias("dc"), F.col("flv.course_id") == F.col("dc.course_id")) \
+    .groupBy(
+        F.col("dl.lesson_id").alias("lesson_id"),
+        F.col("dl.title").alias("lesson_title"),
+        F.col("dc.course_id").alias("course_id"),
+        F.col("dc.title").alias("course_title")
+    ).agg(
+        F.count("flv.lesson_id").alias("total_views"),
+        F.countDistinct("flv.user_id").alias("unique_users"),
+        F.min("flv.viewed_at").alias("first_view"),
+        F.max("flv.viewed_at").alias("last_view")
+    ).orderBy("lesson_id")
+
+inactive_users_summary = dim_user.alias("du") \
+    .join(fact_lesson_views.alias("flv"), F.col("du.user_id") == F.col("flv.user_id"), "left") \
+    .join(fact_enrollments.alias("fe"), F.col("du.user_id") == F.col("fe.user_id"), "left") \
+    .filter(F.col("flv.user_id").isNull()) \
+    .groupBy(
+        F.col("du.user_id").alias("user_id"),
+        F.col("du.name").alias("user_name"),
+        F.col("du.email"),
+        F.col("du.age"),
+        F.col("du.registration_date")
+    ).agg(
+        F.countDistinct("fe.course_id").alias("enrollments_count")
+    ).orderBy("user_id")
+
+course_completion_rate = fact_enrollments.alias("fe") \
+    .join(dim_user.alias("du"), F.col("fe.user_id") == F.col("du.user_id")) \
+    .join(dim_course.alias("dc"), F.col("fe.course_id") == F.col("dc.course_id")) \
+    .join(dim_lesson.alias("dl"), F.col("dc.course_id") == F.col("dl.course_id")) \
+    .join(fact_lesson_views.alias("flv"),
+          (F.col("du.user_id") == F.col("flv.user_id")) &
+          (F.col("dl.lesson_id") == F.col("flv.lesson_id")),
+          "left") \
+    .groupBy(
+        F.col("du.user_id").alias("user_id"),
+        F.col("du.name").alias("user_name"),
+        F.col("dc.course_id").alias("course_id"),
+        F.col("dc.title").alias("course_title")
+    ).agg(
+        F.countDistinct("dl.lesson_id").alias("lessons_in_course"),
+        F.countDistinct("flv.lesson_id").alias("lessons_viewed"),
+        F.when(
+            F.countDistinct("dl.lesson_id") == 0,
+            F.lit(0.0)
+        ).otherwise(
+            F.countDistinct("flv.lesson_id") * 1.0 / F.countDistinct("dl.lesson_id")
+        ).alias("completion_rate")
+    ).orderBy("user_id", "course_id")
+
+output_dir = "data/marts/greenplum"
+os.makedirs(output_dir, exist_ok=True)
+
+lesson_popularity_summary.write.mode("overwrite").option("header", "true").csv(f"{output_dir}/lesson_popularity_summary")
+inactive_users_summary.write.mode("overwrite").option("header", "true").csv(f"{output_dir}/inactive_users_summary")
+course_completion_rate.write.mode("overwrite").option("header", "true").csv(f"{output_dir}/course_completion_rate")
+
+print(".............витрины greenplum созданы")