TheNeuralBit commented on a change in pull request #16015:
URL: https://github.com/apache/beam/pull/16015#discussion_r752505369
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File path: sdks/java/core/src/main/java/org/apache/beam/sdk/util/RowJson.java
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@@ -527,7 +527,9 @@ private void writeValue(JsonGenerator gen, FieldType type,
Object value) throws
gen.writeNumber((BigDecimal) value);
break;
case DATETIME:
- gen.writeString(((DateTime) value).toString()); // ISO 8601 format
+ assert (value instanceof ReadableInstant);
Review comment:
I recognize this is effectively a comment, with the added benefit that
we'll get a nicer error in tests.
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