.

Cargo.toml

@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+chrono = "0.4.19"

src/main.rs

@@ -1,3 +1,41 @@
+#![allow(unused)]
+
 fn main() {
     println!("Hello, world!");
 }
+
+use std::collections::BTreeMap;
+
+type String = std::string::String;
+type Integer = i64;
+type Float = f64;
+type Date = chrono::Date<chrono::Utc>;
+
+struct Table {
+    rows: usize,
+    columns: Vec<Column>,
+    name_to_idx: BTreeMap<String, usize>,
+}
+
+struct Column {
+    name: String,
+    data: ColumnData,
+}
+
+enum ColumnData {
+    Integer(Vec<Integer>),
+    Float(Vec<Float>),
+    String(Vec<String>),
+    Date(Vec<String>),
+}
+
+struct JoinCriteria {
+}
+
+struct SelectCriteria {
+}
+
+impl Table {
+    fn join(&self, other: &Table, crit: JoinCriteria) -> Table { panic!() }
+    fn select(&self, crit: SelectCriteria) -> Table { panic!() }
+}