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[b/330573524] Prevent IF from treating NULL as FALSE #49

Merged
merged 1 commit into from
Mar 28, 2024
Merged

[b/330573524] Prevent IF from treating NULL as FALSE #49

merged 1 commit into from
Mar 28, 2024

Commits on Mar 27, 2024

  1. [b/330573524] Prevent IF from treating NULL as FALSE 

    Tableau offers the IIF function with the signature IIF(bool, val1, val2[, val3]). If bool is TRUE, it returns val1, if it is FALSE, it returns val2, and if it is NULL, it returns val3 if provided, otherwise it returns NULL.

Previously, we translated this behavior by rewriting it as BigQuery's IF. The issue however, is that if bool is NULL, BigQuery defaults to val2 instead of NULL or val3.

This commit corrects for that by wrapping the expression in another IF that checks if bool is NULL. If it is, it returns val3 if specified, otherwise NULL. If bool is not null, it follows normal IF behavior.
    @tanclary
    tanclary committed Mar 27, 2024
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