strongduanmu edited a comment on issue #6942:
URL: https://github.com/apache/shardingsphere/issues/6942#issuecomment-677740258
@sandynz Thank you for the example, and I have reproduced this exception.
The reason for this problem is that the value in the `on duplicate key
statement` is parsed twice, therefore the `parametersCount` is greater than the
actual value by 1.
```java
@Override
public ASTNode visitOnDuplicateKeyClause(final OnDuplicateKeyClauseContext
ctx) {
Collection<AssignmentSegment> columns = new LinkedList<>();
for (AssignmentContext each : ctx.assignment()) {
columns.add((AssignmentSegment) visit(each));
visit(each.assignmentValue());
}
return new OnDuplicateKeyColumnsSegment(ctx.getStart().getStartIndex(),
ctx.getStop().getStopIndex(), columns);
}
```
I will fix this problem as soon as possible.
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