terrymanu commented on issue #3284: Fix assignmentValueNode get error index URL: https://github.com/apache/incubator-shardingsphere/pull/3284#issuecomment-542581832 > > The modification may cause problem. > > Right now we just can recognize 2 model: > > ``` > > 1. xxx = xxx > > > > 2. xxx = values(xxx) > > ``` > > > > > > So the value we need to fetch is index `2` or index `4`. > > I know we cannot get all scenarios, but if we change index to `3` on this pr, the scenario `xxx = values(xxx)` will be broken. > > The problem of this issue is AST. AST should make consist of set assignment as `3` children, the right value should in one node and other more expression should in the next level of AST. > > We need to modify g4 file to change the structure of AST. > > g4 like this will be ok? > > ``` > assignment > : columnName EQ_ assignmentRight_ > ; > > assignmentRight_ > : VALUES LP_ RP_ | assignmentValue > ; > ``` Maybe not enough ,because they may have calculate expression like `values(xx) + values(yy)`
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