mustafasrepo commented on code in PR #7040:
URL: https://github.com/apache/arrow-datafusion/pull/7040#discussion_r1275848819
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datafusion/common/src/dfschema.rs:
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@@ -20,26 +20,315 @@
use std::collections::{HashMap, HashSet};
use std::convert::TryFrom;
+use std::fmt::{Display, Formatter};
use std::hash::Hash;
use std::sync::Arc;
use crate::error::{unqualified_field_not_found, DataFusionError, Result,
SchemaError};
-use crate::{field_not_found, Column, OwnedTableReference, TableReference};
+use crate::{field_not_found, Column, JoinType, OwnedTableReference,
TableReference};
use arrow::compute::can_cast_types;
use arrow::datatypes::{DataType, Field, FieldRef, Fields, Schema, SchemaRef};
-use std::fmt::{Display, Formatter};
/// A reference-counted reference to a `DFSchema`.
pub type DFSchemaRef = Arc<DFSchema>;
+/// This object defines a constraint on a table.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum Constraint {
+ /// Columns with the given indices form a composite primary key (they are
+ /// jointly unique and not nullable):
+ PrimaryKey(Vec<usize>),
+ /// Columns with the given indices form a composite unique key:
+ Unique(Vec<usize>),
+}
+
+/// This object defines a functional dependence in the schema. A functional
Review Comment:
Moved them to their own module.
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