spark-doris-connector/spark-doris-connector-base/src/main/java/org/apache/doris/spark/client/read/AbstractThriftReader.java [261:268]:
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                int asIdx = readColumn.indexOf(" AS ");
                String realColumn = readColumn.substring(asIdx + 4).trim().replaceAll("`", "");
                if (fieldTypeMap.containsKey(realColumn)
                        && ("BITMAP".equalsIgnoreCase(fieldTypeMap.get(realColumn).getType())
                        || "HLL".equalsIgnoreCase(fieldTypeMap.get(realColumn).getType()))) {
                    newFieldList.add(new Field(realColumn, TPrimitiveType.VARCHAR.name(), null, 0, 0, null));
                }
            } else {
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spark-doris-connector/spark-doris-connector-base/src/main/java/org/apache/doris/spark/client/read/DorisFlightSqlReader.java [165:172]:
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                int asIdx = readColumn.indexOf(" AS ");
                String realColumn = readColumn.substring(asIdx + 4).trim().replaceAll("`", "");
                if (fieldTypeMap.containsKey(realColumn)
                        && ("BITMAP".equalsIgnoreCase(fieldTypeMap.get(realColumn).getType())
                        || "HLL".equalsIgnoreCase(fieldTypeMap.get(realColumn).getType()))) {
                    newFieldList.add(new Field(realColumn, TPrimitiveType.VARCHAR.name(), null, 0, 0, null));
                }
            } else {
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