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ast: change the order of visiting select stmt #522

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merged 4 commits into from
Aug 28, 2019
Merged

ast: change the order of visiting select stmt #522

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ast: change the order of visiting select stmt
alivxxx Aug 23, 2019
52dcfa0
address comments
alivxxx Aug 26, 2019
e142743
Revert "address comments"
alivxxx Aug 28, 2019
2bf9ea0
Merge branch 'master' into visit-order
alivxxx Aug 28, 2019
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18 changes: 10 additions & 8 deletions ast/dml.go
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Original file line number Diff line number Diff line change
Expand Up @@ -764,6 +764,8 @@ type SelectStmt struct {
IsAfterUnionDistinct bool
// IsInBraces indicates whether it's a stmt in brace.
IsInBraces bool
// QueryBlockOffset indicates the order of this SelectStmt if counted from left to right in the sql text.
QueryBlockOffset int
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Where would this field be set?

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In TiDB, see https://github.com/pingcap/tidb/pull/11861/files#diff-59f10b93675b42905c972e190d2f059dR45

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It looks pretty weird that the values is set from another repo, can we set it during the induction of parser?

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It seems that there is no way to set it correctly here, since the subpart of select stmt will get the offset first. I don't find good ways to set it correctly here.

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}

// Restore implements Node interface.
Expand Down Expand Up @@ -906,6 +908,14 @@ func (n *SelectStmt) Accept(v Visitor) (Node, bool) {
n.TableHints = newHints
}

if n.Fields != nil {
node, ok := n.Fields.Accept(v)
if !ok {
return n, false
}
n.Fields = node.(*FieldList)
}

if n.From != nil {
node, ok := n.From.Accept(v)
if !ok {
Expand All @@ -922,14 +932,6 @@ func (n *SelectStmt) Accept(v Visitor) (Node, bool) {
n.Where = node.(ExprNode)
}

if n.Fields != nil {
node, ok := n.Fields.Accept(v)
if !ok {
return n, false
}
n.Fields = node.(*FieldList)
}

if n.GroupBy != nil {
node, ok := n.GroupBy.Accept(v)
if !ok {
Expand Down