https://github.com/apache/incubator-doris/issues/3936
Doris On ES can obtain field value from `_source` or `docvalues`:
1. From `_source` , get the origin value as you put, ES process indexing、docvalues for `date` field is converted to millisecond
2. From `docvalues`, before( 6.4 you get `millisecond timestamp` value, after(include) 6.4 you get the formatted `date` value :2020-06-18T12:10:30.000Z, but ES (>=6.4) provide `format` parameter for `docvalue` field request, this would coming soon for Doris On ES
After this PR was merged into Doris, Doris On ES would only correctly support to process `millisecond` timestamp and string format date, if you provided a `seconds` timestamp, Doris On ES would process wrongly which (divided by 1000 internally)
ES mapping:
```
{
"timestamp_test": {
"mappings": {
"doc": {
"properties": {
"k1": {
"type": "date",
"format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis"
}
}
}
}
}
}
```
ES documents:
```
{
"_index": "timestamp_test",
"_type": "doc",
"_id": "AXLbzdJY516Vuc7SL51m",
"_score": 1,
"_source": {
"k1": "2020-6-25"
}
},
{
"_index": "timestamp_test",
"_type": "doc",
"_id": "AXLbzddn516Vuc7SL51n",
"_score": 1,
"_source": {
"k1": 1592816393000 -> 2020/6/22 16:59:53
}
}
```
Doris Table:
```
CREATE EXTERNAL TABLE `timestamp_source` (
`k1` date NULL COMMENT ""
) ENGINE=ELASTICSEARCH
```
### enable_docvalue_scan = false
**For ES 5.5**:
```
mysql> select k1 from timestamp_source;
+------------+
| k1 |
+------------+
| 2020-06-25 |
| 2020-06-22 |
+------------+
```
**For ES 6.5 or above**:
```
mysql> select * from timestamp_source;
+------------+
| k1 |
+------------+
| 2020-06-25 |
| 2020-06-22 |
+------------+
```
### enable_docvalue_scan = true
**For ES 5.5**:
```
mysql> select k1 from timestamp_dv;
+------------+
| k1 |
+------------+
| 2020-06-25 |
| 2020-06-22 |
+------------+
```
**For ES 6.5 or above**:
```
mysql> select * from timestamp_dv;
+------------+
| k1 |
+------------+
| 2020-06-25 |
| 2020-06-22 |
+------------+
```
dc603de4bd