holo-client/src/main/java/com/alibaba/hologres/client/impl/UnnestUpsertStatementBuilder.java [186:215]:
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		if (schema.getKeyIndex().length > 0) {
			sb.append(" on conflict (");
			first = true;
			for (int index : schema.getKeyIndex()) {
				if (!first) {
					sb.append(",");
				}
				first = false;
				sb.append(IdentifierUtil.quoteIdentifier(schema.getColumnSchema()[index].getName(), true));
			}
			sb.append(") do ");
			if (WriteMode.INSERT_OR_IGNORE == mode) {
				sb.append("nothing");
			} else {
				sb.append("update set ");
				first = true;
				set.stream().forEach((index) -> {
					if (!onlyInsertSet.get(index)) {
						if (!first) {
							sb.append(",");
						}
						first = false;
						String columnName = IdentifierUtil.quoteIdentifier(schema.getColumnSchema()[index].getName(), true);
						sb.append(columnName).append("=excluded.").append(columnName);
					}
				});
			}
			if (checkAndPutCondition != null) {
				sb.append(" where");
				sb.append(buildCheckAndPutPattern(checkAndPutCondition));
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holo-client/src/main/java/com/alibaba/hologres/client/impl/UpsertStatementBuilder.java [204:233]:
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		if (schema.getKeyIndex().length > 0) {
			sb.append(" on conflict (");
			first = true;
			for (int index : schema.getKeyIndex()) {
				if (!first) {
					sb.append(",");
				}
				first = false;
				sb.append(IdentifierUtil.quoteIdentifier(schema.getColumnSchema()[index].getName(), true));
			}
			sb.append(") do ");
			if (WriteMode.INSERT_OR_IGNORE == mode) {
				sb.append("nothing");
			} else {
				sb.append("update set ");
				first = true;
				set.stream().forEach((index) -> {
					if (!onlyInsertSet.get(index)) {
						if (!first) {
							sb.append(",");
						}
						first = false;
						String columnName = IdentifierUtil.quoteIdentifier(schema.getColumnSchema()[index].getName(), true);
						sb.append(columnName).append("=excluded.").append(columnName);
					}
				});
			}
			if (checkAndPutCondition != null) {
				sb.append(" where");
				sb.append(buildCheckAndPutPattern(checkAndPutCondition));
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