USING clause (#99)

salsita · Jul 19, 2017 · 4cc9e71 · 4cc9e71
1 parent d84955e
commit 4cc9e71
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diff --git a/README.md b/README.md
@@ -246,6 +246,7 @@ This is required for some SQL operations that cannot be run within a transaction
   - `default` _[string or null]_ - null, string
   - `type` _[string]_ - new datatype
   - `notNull` _[boolean]_ - sets NOT NULL if true
+  - `using` _[string]_ - adds USING clause to change values in column
 
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diff --git a/lib/operations/tables.js b/lib/operations/tables.js
@@ -119,7 +119,12 @@ export const alterColumn = (table_name, column_name, options) => {
     actions.push(`SET DEFAULT ${escapeValue(options.default)}`);
   }
   if (options.type) {
-    actions.push(`SET DATA TYPE ${applyTypeAdapters(options.type)}`);
+    const action = `SET DATA TYPE ${applyTypeAdapters(options.type)}`;
+    actions.push(
+      options.using
+        ? `${action} USING ${options.using}`
+        : action
+    );
   }
   if (options.notNull) {
     actions.push('SET NOT NULL');