docs: clarify NULL handling for quoted vs unquoted CSV values in BigQuery#908
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docs: clarify NULL handling for quoted vs unquoted CSV values in BigQuery#908
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…lues in BigQuery
Expand the Handling NULLs section to explain:
- The difference between unquoted (,,) and quoted ("") empty values in CSV
- Backend-specific behavior comparison (Snowflake vs BigQuery STRING vs numeric)
- Why treatValuesAsNull only works on unquoted values in BigQuery
- The inconsistency where the same CSV value produces NULL for numeric but empty string for STRING columns
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Make it explicit that the difference in NULL handling for quoted empty strings is a limitation of BigQuery's CSV parser, not Keboola Storage, and that BigQuery provides no workaround for this behavior. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
jirkasemmler
approved these changes
Apr 10, 2026
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Summary
,,) and quoted ("") empty values in CSVtreatValuesAsNullonly works on unquoted values in BigQuery (maps to BQ'snullMarkerwhich skips quoted fields)"") producesNULLfor numeric columns but empty string for STRING columns in BigQueryTest plan
🤖 Generated with Claude Code
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com