feat(datestrings): Allow string dates, closes #1765

README.md

@@ -49,7 +49,7 @@ If you are using Maven without BOM, add this to your dependencies:
 If you are using Gradle 5.x or later, add this to your dependencies:
 
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:26.1.5')
+implementation platform('com.google.cloud:libraries-bom:26.2.0')
 
 implementation 'com.google.cloud:google-cloud-bigquerystorage'
 ```

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/JsonToProtoMessage.java

@@ -452,6 +452,12 @@ private static void fillField(
         }
         break;
       case STRING:
+        if (fieldSchema != null && fieldSchema.getType() == TableFieldSchema.Type.DATE) {
+          if (val instanceof String) {
+            protoMsg.setField(fieldDescriptor, (String) val);
+            return;
+          }
+        }
         if (val instanceof String) {
           protoMsg.setField(fieldDescriptor, (String) val);
           return;
@@ -710,6 +716,12 @@ private static void fillRepeatedField(
           }
           break;
         case STRING:
+          if (fieldSchema != null && fieldSchema.getType() == TableFieldSchema.Type.DATE) {
+            if (val instanceof String) {
+              protoMsg.setField(fieldDescriptor, (String) val);
+              return;
+            }
+          }
           if (val instanceof String) {
             protoMsg.addRepeatedField(fieldDescriptor, (String) val);
           } else {

google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/JsonToProtoMessageTest.java

@@ -731,11 +731,18 @@ public void testDate() throws Exception {
         TableSchema.newBuilder()
             .addFields(TableFieldSchema.newBuilder(TEST_DATE).setName("test_string").build())
             .addFields(TableFieldSchema.newBuilder(TEST_DATE).setName("test_long").build())
+            .addFields(TableFieldSchema.newBuilder(TEST_DATE).setName("test_iso_string").build())
+            .build();
+    TestDate expectedProto =
+        TestDate.newBuilder()
+            .setTestString(18935)
+            .setTestLong(18935)
+            .setTestIsoString("1999-01-01")
             .build();
-    TestDate expectedProto = TestDate.newBuilder().setTestString(18935).setTestLong(18935).build();
     JSONObject json = new JSONObject();
     json.put("test_string", "2021-11-04");
     json.put("test_long", 18935L);
+    json.put("test_iso_string", "1999-01-01");
     DynamicMessage protoMsg =
         JsonToProtoMessage.convertJsonToProtoMessage(TestDate.getDescriptor(), tableSchema, json);
     assertEquals(expectedProto, protoMsg);

google-cloud-bigquerystorage/src/test/proto/jsonTest.proto

@@ -159,6 +159,7 @@ message TestTimestamp {
 message TestDate {
   optional int32 test_string = 1;
   optional int32 test_long = 2;
+  optional string test_iso_string = 3;
 }
 
 message NestedRepeated {