IS NULL 的索引支持
Recorded source states and original language descriptions. Missing version evidence stays unknown.
The source snapshot records transitions for PostgreSQL 8.1–18. The historical matrix records independent cells for 7.4–18. Neither records support for PostgreSQL 19 or 20; newer versions remain unknown. These source claims are distinct from runtime measurements.
No translation of this description is recorded. The original Chinese description is shown. The source label is retained in Chinese; no translated label is recorded.
索引和约束
Description
允许在 IS NULL 表达式中使用索引
Selected version: PostgreSQL 18
No
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Original documentation links
Related source snapshot entry · The original source supplies this relationship; each matrix retains its own states.
Complete source facts and provenance
legacy · center · fa744d315d3f009d05cf00952dc6e072a81dd2aaf92b6228edd983d2488b98c2
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