Complex Relational Entity Resolution Pipeline

How do we resolve raw CRM leads against established master accounts and coalesce fallback master IDs?

Advanced⏱ 3 Minutes⭐ 620 XP

🤔 THE QUESTION

How do we resolve raw CRM leads against established master accounts and coalesce fallback master IDs?

💡 WHAT IS IT?

An entity resolution pipeline performing aliased left joins and coalescing master account keys with lead keys.

🎯 WHAT IS IT USED FOR?

Enterprise Master Data Management (MDM), customer identity resolution, and marketing attribution.

💻 EXAMPLE

from pyspark.sql.functions import col, coalesce

resolved_df = raw_leads.alias("lead").join(
    crm_accounts.alias("crm"),
    col("lead.email") == col("crm.primary_email"),
    "left"
).select(
    col("lead.lead_id"),
    coalesce(col("crm.account_id"), col("lead.lead_id")).alias("master_id"),
    col("lead.email"),
    col("crm.company_name")
)

🎯 Mission Objectives

Practice typing production-grade PySpark code for Complex Relational Entity Resolution Pipeline.

✓ Alias leads and CRM DataFrames
✓ Match on customer email addresses
✓ Coalesce CRM master ID with lead fallback

🚀 Start Mission

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