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Small comment fixes and enhancements.
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@@ -134,7 +134,8 @@ typedef struct PredXactListData
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/*
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* These global variables are maintained when registering and cleaning up
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* serializable transactions. They must be global across all backends,
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* but are not needed outside the predicate.c source file.
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* but are not needed outside the predicate.c source file. Protected
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* by SerializableXactHashLock.
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*/
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TransactionId SxactGlobalXmin; /* global xmin for active serializable
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* transactions */
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