> ## Documentation Index
> Fetch the complete documentation index at: https://docs.planasonix.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Data lineage

> Trace data from source to destination with column-level lineage.

**Lineage** shows how data flows through pipelines: which source columns feed which transforms and which destination columns they populate. Column-level lineage answers audit questions that table-level graphs cannot.

## Premium+ feature

Fine-grained lineage (column mapping across complex SQL and multi-hop graphs) requires **Premium+** or **Enterprise** entitlements, depending on your contract. Table-only lineage previews may appear on lower tiers. Your billing admin can confirm the exact SKU.

## Column lineage visualization

Open a pipeline and launch the **Lineage** view. Select a destination column to highlight upstream columns and intermediate expressions. Select a source column to see every sink it influences.

<Tip>
  Use lineage during code review: if a column shows unexpected upstream paths, investigate joins and aliases before merge.
</Tip>

## Table-level lineage

Table-level graphs summarize nodes as black boxes—useful for executive summaries and coarse impact checks. Drill down to column lineage when you need proof for regulators or internal auditors.

<AccordionGroup>
  <Accordion title="SQL transforms">
    Lineage parses SELECT lists, joins, and unions when dialect features are supported; dynamic SQL may appear partially resolved—document such nodes manually.
  </Accordion>

  <Accordion title="Non-SQL nodes">
    Visual transforms emit lineage when metadata is explicit; custom code may require annotations.
  </Accordion>
</AccordionGroup>

## Operational uses

<Tabs>
  <Tab title="Incident response">
    When a dashboard breaks, trace the broken metric to the warehouse column and upstream ingestion job in minutes instead of hours.
  </Tab>

  <Tab title="Deprecation">
    Prove no active pipelines consume a column before you drop it.
  </Tab>

  <Tab title="Compliance">
    Export lineage snapshots for GDPR or SOX workflows showing PII propagation paths.
  </Tab>
</Tabs>

## Related topics

<CardGroup cols={2}>
  <Card title="Impact analysis" icon="chart-network" href="/governance/impact-analysis">
    Quantify downstream scope of changes.
  </Card>

  <Card title="Pipelines overview" icon="diagram-project" href="/pipelines/overview">
    Author graphs lineage can parse.
  </Card>
</CardGroup>