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feat: enhance VirtualTable to have expression as value #711

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merged 4 commits into from
Oct 7, 2024
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feat: enhance VirtualTable to have expression as value #711

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19996a8
feat: add VirtualExpressionTable definition and use it in ReadRel
anshuldata Sep 26, 2024
b2e3d6b
Update to Doc to indicate VirtualExpressionTable values are not depen…
anshuldata Sep 30, 2024
5938f28
add virtual table values to also take expression and mark existing li…
anshuldata Oct 3, 2024
e8b85dd
address review comments
anshuldata Oct 4, 2024
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5 changes: 3 additions & 2 deletions proto/substrait/algebra.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -86,9 +86,10 @@ message ReadRel {
substrait.extensions.AdvancedExtension advanced_extension = 10;
}

// A table composed of literals.
// A table composed of expressions.
message VirtualTable {
repeated Expression.Literal.Struct values = 1;
repeated Expression.Literal.Struct values = 1 [deprecated = true];
repeated Expression expressions = 2;
}

// A stub type that can be used to extend/introduce new table types outside
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5 changes: 4 additions & 1 deletion site/docs/relations/logical_relations.md
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Expand Up @@ -51,12 +51,15 @@ Read definition types (like the rest of the features in Substrait) are built by
#### Virtual Table

A virtual table is a table whose contents are embedded in the plan itself. The table data
is encoded as records consisting of literal values.
is encoded as records consisting of literal values or expressions that can be resolved without referencing any input data.
For example, a literal, a function call involving literals, or any other expression that does
not require input.

| Property | Description | Required |
| -------- | ----------- | -------- |
| Data | Required | Required |


#### Named Table

A named table is a reference to data defined elsewhere. For example, there may be a catalog
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