fix(dynamodb): remove global secondary index limit (#2301)

Fixes #2262

Author: Elad Ben-Israel

packages/@aws-cdk/aws-dynamodb/lib/table.ts

@@ -9,6 +9,9 @@ import { ScalableTableAttribute } from './scalable-table-attribute';
 const HASH_KEY_TYPE = 'HASH';
 const RANGE_KEY_TYPE = 'RANGE';
 
+// https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html#limits-secondary-indexes
+const MAX_LOCAL_SECONDARY_INDEX_COUNT = 5;
+
 const READ_DATA_ACTIONS = [
   'dynamodb:BatchGetItem',
   'dynamodb:GetRecords',
@@ -254,11 +257,6 @@ export class Table extends Construct {
    * @param props the property of global secondary index
    */
   public addGlobalSecondaryIndex(props: GlobalSecondaryIndexProps) {
-    if (this.globalSecondaryIndexes.length === 5) {
-      // https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html#limits-secondary-indexes
-      throw new RangeError('a maximum number of global secondary index per table is 5');
-    }
-
     this.validateProvisioning(props);
     this.validateIndexName(props.indexName);
 
@@ -286,9 +284,9 @@ export class Table extends Construct {
    * @param props the property of local secondary index
    */
   public addLocalSecondaryIndex(props: LocalSecondaryIndexProps) {
-    if (this.localSecondaryIndexes.length === 5) {
-      // https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html#limits-secondary-indexes
-      throw new RangeError('a maximum number of local secondary index per table is 5');
+    // https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html#limits-secondary-indexes
+    if (this.localSecondaryIndexes.length >= MAX_LOCAL_SECONDARY_INDEX_COUNT) {
+      throw new RangeError(`a maximum number of local secondary index per table is ${MAX_LOCAL_SECONDARY_INDEX_COUNT}`);
     }
 
     this.validateIndexName(props.indexName);

packages/@aws-cdk/aws-dynamodb/test/test.dynamodb.ts

@@ -782,20 +782,6 @@ export = {
     test.done();
   },
 
-  'error when adding more than 5 global secondary indexes'(test: Test) {
-    const stack = new Stack();
-    const table = new Table(stack, CONSTRUCT_NAME, { partitionKey: TABLE_PARTITION_KEY, sortKey: TABLE_SORT_KEY });
-    const gsiGenerator = GSI_GENERATOR();
-    for (let i = 0; i < 5; i++) {
-      table.addGlobalSecondaryIndex(gsiGenerator.next().value);
-    }
-
-    test.throws(() => table.addGlobalSecondaryIndex(gsiGenerator.next().value),
-      /a maximum number of global secondary index per table is 5/);
-
-    test.done();
-  },
-
   'when adding a global secondary index without specifying read and write capacity'(test: Test) {
     const stack = new Stack();
     const table = new Table(stack, CONSTRUCT_NAME, { partitionKey: TABLE_PARTITION_KEY, sortKey: TABLE_SORT_KEY });