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Update substr.txt #1604

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8 changes: 7 additions & 1 deletion source/reference/operator/aggregation/substr.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ $substr (aggregation)

.. expression:: $substr

:expression:`$substr` takes a string and two numbers. The first
:expression:`$substr` takes a string or integer and two numbers. The first
number represents the number of bytes in the string to skip,
and the second number specifies the number of bytes to return
from the string.
Expand All @@ -16,3 +16,9 @@ $substr (aggregation)
:expression:`$substr` is not encoding aware and if used
improperly may produce a result string containing an invalid UTF-8
character sequence.


If the first argument to :expression:`$substr` is an integer, then the
result is cast as a string from the starting skipped bytes to the number
of bytes returned