robinyqiu commented on a change in pull request #12550:
URL: https://github.com/apache/beam/pull/12550#discussion_r469466085
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File path:
sdks/java/extensions/sql/zetasql/src/main/java/org/apache/beam/sdk/extensions/sql/zetasql/ZetaSqlCalciteTranslationUtils.java
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@@ -180,12 +182,19 @@ private static RelDataType toCalciteStructType(
private static List<String> getFieldNameList(List<StructField> fields) {
ImmutableList.Builder<String> b = ImmutableList.builder();
+ Set<String> usedName = new HashSet<>();
for (int i = 0; i < fields.size(); i++) {
String name = fields.get(i).getName();
- if ("".equals(name)) {
- name = "$col" + i; // avoid empty field names because Beam does not
allow duplicate names
+ // Follow the same way that BigQuery handles unspecified or duplicate
field name
+ if ("".equals(name) || usedName.contains(name)) {
Review comment:
OK I got your point now. So I believe the condition should be
`"".equals(name) || name.startsWith("_field_") || usedName.contains(name)`.
This way we can avoid throwing the exception.
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