meaningful error

Author: JasonShin

src/ts_generator/errors.rs

@@ -32,6 +32,8 @@ pub enum TsGeneratorError {
   TableFactorWhileProcessingTableWithJoins(String),
   #[error("[E014] Failed to find a table name from a FROM statement: statement: `{0}`")]
   UnknownErrorWhileProcessingTableWithJoins(String),
+  #[error("[E015] Table expressions are not supported in INSERT statements - query: `{0}`")]
+  TableExpressionInInsertStatement(String),
   #[error("Unknown error: `{0}`")]
   Unknown(String),
 }

src/ts_generator/sql_parser/translate_insert.rs

@@ -104,7 +104,11 @@ VALUES (value1, value2, value3, ...);
     SetExpr::Update(update) => translate_stmt(ts_query, &update, None, conn).await?,
     SetExpr::Delete(delete) => translate_stmt(ts_query, &delete, None, conn).await?,
     SetExpr::Merge(merge) => translate_stmt(ts_query, &merge, None, conn).await?,
-    SetExpr::Table(_) => unimplemented!("Table expressions are not supported in INSERT statements"),
+    SetExpr::Table(table) => {
+      return Err(TsGeneratorError::TableExpressionInInsertStatement(
+        format!("INSERT INTO {} ... FROM {}", table_name, table),
+      ));
+    }
   }
 
   Ok(())