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Merge pull request #35399 from wangxinalex/patch-2

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fix: modify `dictGet*` functions
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Maksim Kita 2022-03-18 16:18:15 +03:00 committed by GitHub
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docs/en/sql-reference/dictionaries/external-dictionaries/external-dicts-dict-layout.md
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@ -225,15 +225,15 @@ This storage method works the same way as hashed and allows using date/time (arb
Example: The table contains discounts for each advertiser in the format:
``` text
+---------|-------------|-------------|------+
+---------------|---------------------|-------------------|--------+
| advertiser id | discount start date | discount end date | amount |
+===============+=====================+===================+========+
| 123 | 2015-01-01 | 2015-01-15 | 0.15 |
+---------|-------------|-------------|------+
+---------------|---------------------|-------------------|--------+
| 123 | 2015-01-16 | 2015-01-31 | 0.25 |
+---------|-------------|-------------|------+
+---------------|---------------------|-------------------|--------+
| 456 | 2015-01-01 | 2015-01-15 | 0.05 |
+---------|-------------|-------------|------+
+---------------|---------------------|-------------------|--------+
```
To use a sample for date ranges, define the `range_min` and `range_max` elements in the [structure](../../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-structure.md). These elements must contain elements `name` and `type` (if `type` is not specified, the default type will be used - Date). `type` can be any numeric type (Date / DateTime / UInt64 / Int32 / others).
@ -272,10 +272,10 @@ LAYOUT(RANGE_HASHED())
RANGE(MIN first MAX last)
```
To work with these dictionaries, you need to pass an additional argument to the `dictGetT` function, for which a range is selected:
To work with these dictionaries, you need to pass an additional argument to the `dictGet*` function, for which a range is selected:
``` sql
dictGetT('dict_name', 'attr_name', id, date)
dictGet*('dict_name', 'attr_name', id, date)
```
This function returns the value for the specified `id`s and the date range that includes the passed date.
@ -479,17 +479,17 @@ This type of storage is for mapping network prefixes (IP addresses) to metadata
Example: The table contains network prefixes and their corresponding AS number and country code:
``` text
+-----------|-----|------+
+-----------------|-------|--------+
| prefix | asn | cca2 |
+=================+=======+========+
| 202.79.32.0/20 | 17501 | NP |
+-----------|-----|------+
+-----------------|-------|--------+
| 2620:0:870::/48 | 3856 | US |
+-----------|-----|------+
+-----------------|-------|--------+
| 2a02:6b8:1::/48 | 13238 | RU |
+-----------|-----|------+
+-----------------|-------|--------+
| 2001:db8::/32 | 65536 | ZZ |
+-----------|-----|------+
+-----------------|-------|--------+
```
When using this type of layout, the structure must have a composite key.
@ -538,10 +538,10 @@ PRIMARY KEY prefix
The key must have only one String type attribute that contains an allowed IP prefix. Other types are not supported yet.
For queries, you must use the same functions (`dictGetT` with a tuple) as for dictionaries with composite keys:
For queries, you must use the same functions (`dictGet*` with a tuple) as for dictionaries with composite keys:
``` sql
dictGetT('dict_name', 'attr_name', tuple(ip))
dictGet*('dict_name', 'attr_name', tuple(ip))
```
The function takes either `UInt32` for IPv4, or `FixedString(16)` for IPv6: