Fix ambiguous column references in spatial queries

Resolves an issue where column references were becoming ambiguous in complex
joins involving geometry columns. This change modifies the path generation
to explicitly qualify columns with their schema or table alias, replacing
the previous approach that created unqualified column names. Specifically,
we now prepend the schema or alias name with a dot separator before the
column path, ensuring proper SQL column qualification.

This prevents errors like "column reference is ambiguous" when using spatial
functions on tables with similar column names in multi-table joins.

Signed-off-by: bwdmr <[email protected]>

Author: bwdmr

Sources/FluentPostGIS/Queries/QueryBuilder+Helpers.swift

@@ -15,8 +15,9 @@ extension QueryBuilder {
     static func path<M, F>(_ field: KeyPath<M, F>) -> any SQLExpression
         where M: Schema, F: QueryableProperty, F.Model == M
     {
-        let path = M.path(for: field).map(\.description).joined(separator: "_")
-        return SQLColumn(path)
+        let schema = SQLIdentifier(M.schemaOrAlias)
+        let path = SQLIdentifier(M.path(for: field).map(\.description).joined(separator: "_"))
+        return SQLColumn(path, table: schema)
     }
 }