Overview
Use the stream attributes properties tab to specify the characteristics of the the data in a table column.
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| Field | Description | ||||||||||
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| Indexed |
To improve performance, index an attribute when the stream has a large data set and an output pipe from the stream uses this attribute to:
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| Filter conditions are case-independent by default |
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| Key |
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| Cache Key | Enter an expression to be evaluated for each stream item (data record) in the stream. The expression can
Once calculated, the cache key value persists throughout subsequent stream calculation, rather than being created from scratch for each stream item as normal. This allows you to keep track of the calculation as it progresses. This means you can use a "persistent" attribute value in other expressions. CHECK THIS |
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Which fields can have "null"?
String
Apply a string type to sequences of characters (i.e., letters, numerals, symbols and punctuation marks). By default string attribute types have a fixed length of 50. The minimum length is 1 and the maximum length is 4000.
do we need to tell users about any information-loss if data that is naturally a different type gets loaded as a string?
Anchor Bigstring Bigstring
Bigstring
| Bigstring | |
| Bigstring |
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The maximum bigstring size can be configured in System Configuration → System Tuning → Maximum Bigstring Size.
Integer
Apply an integer type to whole numbers (not a fractions or decimals) that can be positive, negative, or zero.
What happens if you attempt to load a float or decimal number into an integer attribute? If you store a number with decimal places as an integer it will be truncated.
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Apply a datetime type to representations of a time, or day and time.
Are there any specific formats to say are recognised/not recognised?
datetime must be day and time, can't be just a time.
Same formats as for date but with HH:mm:ss on the end.
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