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XMIN_FROZEN

spg_engine

Constant XMIN_FROZEN 

Source 
pub const XMIN_FROZEN: u64 = 1; // 1u64
Expand description

Sentinel used for xmin on rows loaded from a pre-v7.37.15 envelope. Any non-zero value < every real transaction id works — we pick 1 (PG uses FrozenTransactionId = 2).