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parser: add AsOfClause for START TRANSACTION READ ONLY statement #1215

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merged 10 commits into from
May 18, 2021
Merged

parser: add AsOfClause for START TRANSACTION READ ONLY statement #1215

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f41eb27
Add AsOfClause for START TRANSACTION READ ONLY statement
JmPotato Apr 27, 2021
2dcbd7c
Rename the new function to tidb_bound_staleness
JmPotato Apr 28, 2021
df181d4
Resolve the conflict
JmPotato May 10, 2021
0d667f6
Update the comment of AS OF
JmPotato May 10, 2021
369521b
Rename to tidb_staleness_bound
JmPotato May 12, 2021
8e88feb
Merge branch 'master' of github.com:pingcap/parser into as_of_beginsmt
JmPotato May 13, 2021
6613963
Rename to tidb_bounded_staleness
JmPotato May 13, 2021
2f44740
Resolve the conflict
JmPotato May 13, 2021
40e445b
Resolve the conflict
JmPotato May 14, 2021
c861e0a
Merge branch 'master' into as_of_beginsmt
JmPotato May 18, 2021
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7 changes: 6 additions & 1 deletion ast/functions.go
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Expand Up @@ -176,7 +176,12 @@ const (
Year = "year"
YearWeek = "yearweek"
LastDay = "last_day"
TiDBParseTso = "tidb_parse_tso"
// TSO functions
// TiDBStalenessBound is used to determine the TS for a read only request with the given bounded staleness.
// It will be used in the Stale Read feature.
// For more info, please see AsOfClause.
TiDBStalenessBound = "tidb_staleness_bound"
TiDBParseTso = "tidb_parse_tso"

// string functions
ASCII = "ascii"
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6 changes: 6 additions & 0 deletions ast/misc.go
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Expand Up @@ -391,6 +391,9 @@ type BeginStmt struct {
ReadOnly bool
Bound *TimestampBound
CausalConsistencyOnly bool
// AS OF is used to read the data at a specific point of time.
// Should only be used when ReadOnly is true.
AsOf *AsOfClause
}

// Restore implements Node interface.
Expand All @@ -415,6 +418,9 @@ func (n *BeginStmt) Restore(ctx *format.RestoreCtx) error {
ctx.WriteKeyWord(" WITH TIMESTAMP BOUND MIN READ TIMESTAMP ")
return n.Bound.Timestamp.Restore(ctx)
}
} else if n.AsOf != nil {
ctx.WriteKeyWord(" ")
return n.AsOf.Restore(ctx)
}
} else if n.CausalConsistencyOnly {
ctx.WriteKeyWord("START TRANSACTION WITH CAUSAL CONSISTENCY ONLY")
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