Problem Summary:
Of course, master is normal.
1. Routine load task
```
CREATE ROUTINE LOAD kafka_load_task ON test_123
WITH APPEND
COLUMNS(ot,time=from_unixtime(`ot`),id,name,content),
PRECEDING FILTER ((`ot` > 0) AND (`id` != ''))
PROPERTIES
(
"max_error_number" = "0",
"max_filter_ratio" = "1.0",
"max_batch_interval" = "10",
"max_batch_rows" = "300000",
"max_batch_size" = "209715200",
"format" = "json",
"jsonpaths" = "[
\"$.time\",
\"$.id\",
\"$.name\",
\"$.\"
]",
"strip_outer_array" = "false",
"num_as_string" = "false",
"fuzzy_parse" = "false",
"strict_mode" = "false",
"timezone" = "Asia/Shanghai",
"exec_mem_limit" = "2147483648"
)
FROM KAFKA
(
"kafka_broker_list" = "127.0.0.1:9092",
"kafka_topic" = "test-topic",
"property.kafka_default_offsets" = "OFFSET_BEGINNING",
"property.group.id" = "test-groupid-1"
);
```
`I want to use the $. symbol to put the entire JSON string from Kafka
into the context field. In the version before the fix, an error would
occur: exception=[E-1721] Size of filter doesn't match size of column:
size=0, filter.size=1. The JSON data in Kafka has other fields besides
time, id, and name, but my requirement is only to get time, id, and
name.`
### Release note
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- [ ] Yes. <!-- Explain the behavior change -->
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0f1f0cd4ca