2021-10-03 21:17:55 +08:00
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# Visitor Pattern
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Visitor Pattern is used in segcore for parse and execute Execution Plan.
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2021-12-24 12:13:18 +08:00
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1. Inside `${core}/src/query/PlanNode.h`, contains physical plan for vector search:
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1. `FloatVectorANNS` FloatVector search execution node
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2. `BinaryVectorANNS` BinaryVector search execution node
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2021-12-24 12:13:18 +08:00
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2. `${core}/src/query/Expr.h` contains physical plan for scalar expression:
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2021-10-03 21:17:55 +08:00
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1. `TermExpr` support operation like `col in [1, 2, 3]`
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2. `RangeExpr` support constant compare with data column like `a >= 5` `1 < b < 2`
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3. `CompareExpr` support compare with different columns, like `a < b`
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4. `LogicalBinaryExpr` support and/or
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5. `LogicalUnaryExpr` support not
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2021-12-30 12:21:46 +08:00
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Currently, under `${core/query/visitors}` directory, there are the following visitors:
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2021-11-16 13:17:25 +08:00
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1. `ShowPlanNodeVisitor` prints PlanNode in json
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2. `ShowExprVisitor` Expr -> json
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2021-11-15 19:51:47 +08:00
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3. `Verify...Visitor` validates ...
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2021-12-23 10:49:11 +08:00
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4. `ExtractInfo...Visitor` extracts info from..., including involved_fields and else
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5. `ExecExprVisitor` generates bitmask according to expression
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6. `ExecPlanNodeVistor` physical plan executor only supports ANNS node for now
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