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copy: update docs for FORCE_NULL and FORCE_NOT_NULL combination
Also update regression tests Patch by Michael Paquier
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@@ -487,6 +487,13 @@ COPY <replaceable class="parameter">count</replaceable>
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<command>VACUUM</command> to recover the wasted space.
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</para>
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<para>
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<literal>FORCE_NULL</> and <literal>FORCE_NOT_NULL</> can be used
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simultaneously on the same column. This has as result to convert quoted
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null strings to null values and to convert unquoted null strings to
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empty strings.
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</para>
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</refsect1>
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<refsect1>
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