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SERVER-6801 Document lack of character encoding support in $substr. #137

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Aug 20, 2012
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SERVER-6801 Document lack of character encoding support in $substr. #137

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10 changes: 8 additions & 2 deletions source/reference/aggregation.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -732,10 +732,16 @@ These operators manipulate strings within projection expressions.
.. expression:: $substr

:expression:`$substr` takes a string and two numbers. The first
number represents the number of characters in the string to skip,
and the second number specifies the number of characters to return
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.

.. note::

::expression:`$substr` is not encoding aware and if used
improperly may produce a result string containing an invalid utf-8
character sequence.

.. expression:: $toLower

Takes a single string and converts that string to lowercase,
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