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GdaDataModel column indexes

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Management of #GdaDataModel column index attributes

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<!-- ##### SECTION See_Also ##### -->
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<!-- ##### SECTION Stability_Level ##### -->


<!-- ##### STRUCT GdaColumnIndex ##### -->
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<!-- ##### ENUM GdaSorting ##### -->
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</para>

@GDA_SORTING_ASCENDING: 
@GDA_SORTING_DESCENDING: 

<!-- ##### STRUCT GdaColumnIndex ##### -->
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</para>


<!-- ##### STRUCT GdaColumnIndexClass ##### -->
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@parent_class: 

<!-- ##### STRUCT GdaColumnIndexPrivate ##### -->
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<!-- ##### FUNCTION gda_column_index_new ##### -->
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</para>

@Returns: 


<!-- ##### FUNCTION gda_column_index_copy ##### -->
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</para>

@dmcia: 
@Returns: 


<!-- ##### FUNCTION gda_column_index_equal ##### -->
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</para>

@lhs: 
@rhs: 
@Returns: 


<!-- ##### FUNCTION gda_column_index_get_column_name ##### -->
<para>

</para>

@dmcia: 
@Returns: 


<!-- ##### FUNCTION gda_column_index_set_column_name ##### -->
<para>

</para>

@dmcia: 
@column_name: 


<!-- ##### FUNCTION gda_column_index_get_defined_size ##### -->
<para>

</para>

@dmcia: 
@Returns: 


<!-- ##### FUNCTION gda_column_index_set_defined_size ##### -->
<para>

</para>

@dmcia: 
@size: 


<!-- ##### FUNCTION gda_column_index_get_sorting ##### -->
<para>

</para>

@dmcia: 
@Returns: 


<!-- ##### FUNCTION gda_column_index_set_sorting ##### -->
<para>

</para>

@dmcia: 
@sorting: 


<!-- ##### FUNCTION gda_column_index_get_references ##### -->
<para>

</para>

@dmcia: 
@Returns: 


<!-- ##### FUNCTION gda_column_index_set_references ##### -->
<para>

</para>

@dmcia: 
@ref: 


