You know, when people ask ‘Does Calcite support lineage?’, I’m never quite sure. People mean different things by lineage, and it takes a bit of effort to set up the required APIs.
I think the way to solve this question is with unit tests. Can write a unit test that fails, or point to an existing test that almost does what you need? For example, is there a test to get the lineage of a view column? Julian > On Sep 5, 2022, at 2:52 AM, Jiajun Xie <jiajunbernou...@gmail.com> wrote: > > Hi, all: > I want to know which virtual column is in use. For example, > ``` > CREATE TABLE peoples(age int, virtual_age int as (age + 1) virtual); > SELECT virtual_age from peoples; > ``` > After converting, the virtual column is expanded to expression. > ``` > LogicalProject(virtual_age=[+($0, 1)]) > LogicalTableScan(table=[[default_ns, default, peoples]]) > ``` > So `RelMetadataQuery#getColumnOrigins` return RelColumnOrigin that is > age(not is virtual_age). > > I try to rewrite code in the implementation class of > `InitializerExpressionFactory`, but I can't know which column is in use. > When I confirm which column is in use, I can't know if the expression is > from a virtual column. > > Does anyone have relevant experience? Thanks~
