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Revert "Convert *GetDatum() and DatumGet*() macros to inline functions"
This reverts commit 595836e99b
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It has problems when USE_FLOAT8_BYVAL is off.
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@ -2763,7 +2763,7 @@ c_overpaid(PG_FUNCTION_ARGS)
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is null. <function>GetAttributeByName</function> returns a <type>Datum</type>
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value that you can convert to the proper data type by using the
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appropriate <function>DatumGet<replaceable>XXX</replaceable>()</function>
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function. Note that the return value is meaningless if the null flag is
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macro. Note that the return value is meaningless if the null flag is
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set; always check the null flag before trying to do anything with the
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result.
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</para>
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