Scalar type representation (#165)

<!-- The PR description should answer 2 (maybe 3) important questions:
-->

### What
Return proper representation for scalar types. Still need to verify
and/or fix serialization of types.

<!-- What is this PR trying to accomplish (and why, if it's not
obvious)? -->

### How

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steps)? -->

---------

Co-authored-by: Daniel Harvey <[email protected]>

crates/configuration/src/introspection.rs

@@ -1,4 +1,5 @@
 //! Configuration and state for our connector.
+use ndc_models::TypeRepresentation;
 use serde::Deserialize;
 
 #[derive(Deserialize, Debug)]
@@ -64,3 +65,32 @@ pub struct IntrospectionForeignKeyColumn {
 pub struct IntrospectionSchema {
     pub name: String,
 }
+
+pub fn map_type_representation(sql_type: &str) -> Option<TypeRepresentation> {
+    match sql_type.to_lowercase().as_str() {
+        "bigint" => Some(TypeRepresentation::Int64),
+        "bit" => Some(TypeRepresentation::Boolean),
+        "decimal" | "numeric" | "money" | "smallmoney" => Some(TypeRepresentation::BigDecimal),
+        "int" => Some(TypeRepresentation::Int32),
+        "smallint" => Some(TypeRepresentation::Int16),
+        "tinyint" => Some(TypeRepresentation::Int16),
+        "float" => Some(TypeRepresentation::Float64),
+        "real" => Some(TypeRepresentation::Float32),
+        "date" => Some(TypeRepresentation::Date),
+        "datetime" | "datetime2" | "smalldatetime" => Some(TypeRepresentation::Timestamp),
+        "datetimeoffset" => Some(TypeRepresentation::TimestampTZ),
+        "time" | "timestamp" => Some(TypeRepresentation::String),
+        "char" | "varchar" | "text" | "nchar" | "nvarchar" | "ntext" => {
+            Some(TypeRepresentation::String)
+        }
+        "binary" | "varbinary" | "image" => Some(TypeRepresentation::String),
+        "uniqueidentifier" => Some(TypeRepresentation::UUID),
+        "xml" => Some(TypeRepresentation::String),
+        "json" => Some(TypeRepresentation::JSON),
+        // TODO: Add support for hierarchyid and sql_variant
+        // "geometry" => Some(TypeRepresentation::Geometry),
+        // "geography" => Some(TypeRepresentation::Geography),
+        // "hierarchyid" | "sql_variant" => XXX,
+        _ => None,
+    }
+}

crates/ndc-sqlserver/src/schema.rs

@@ -12,9 +12,8 @@ use ndc_sdk::models::ObjectTypeName;
 use ndc_sdk::models::ProcedureName;
 use ndc_sdk::models::ScalarTypeName;
 use ndc_sdk::models::TypeRepresentation;
-use query_engine_metadata::metadata;
-
 use ndc_sqlserver_configuration as configuration;
+use query_engine_metadata::metadata;
 use query_engine_metadata::metadata::stored_procedures::{
     StoredProcedureArgumentInfo, StoredProcedures,
 };
@@ -308,8 +307,9 @@ pub fn get_schema(
                 (
                     scalar_type.0.clone().into(),
                     models::ScalarType {
-                        // TODO(PY): Add representation for beta
-                        representation: None,
+                        representation: configuration::introspection::map_type_representation(
+                            scalar_type.0.as_str(),
+                        ),
                         aggregate_functions: metadata
                             .aggregate_functions
                             .0

crates/ndc-sqlserver/tests/snapshots/mutation_tests__stored_procedures__execute_stored_procedure_with_relationships.snap

@@ -13,31 +13,31 @@ expression: result
             "rows": [
               {
                 "InvoiceId": 98,
-                "Total": 3.98
+                "Total": "3.98"
               },
               {
                 "InvoiceId": 121,
-                "Total": 3.96
+                "Total": "3.96"
               },
               {
                 "InvoiceId": 143,
-                "Total": 5.94
+                "Total": "5.94"
               },
               {
                 "InvoiceId": 195,
-                "Total": 0.99
+                "Total": "0.99"
               },
               {
                 "InvoiceId": 316,
-                "Total": 1.98
+                "Total": "1.98"
               },
               {
                 "InvoiceId": 327,
-                "Total": 13.86
+                "Total": "13.86"
               },
               {
                 "InvoiceId": 382,
-                "Total": 8.91
+                "Total": "8.91"
               }
             ]
           }

crates/ndc-sqlserver/tests/snapshots/query_tests__types__select_value_types.snap

@@ -6,10 +6,10 @@ expression: result
   {
     "rows": [
       {
-        "bigint": 1,
+        "bigint": "1",
         "int": 245,
         "float": 24.555,
-        "numeric": 24.555,
+        "numeric": "24.555",
         "char": "s",
         "text": "textual text",
         "date": "2021-12-21",