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docs: clarify plpython SD and GD dictionary behavior
Reported-by: Adam Bielański Discussion: https://postgr.es/m/153484305538.1370.7605856225879294548@wrigleys.postgresql.org Backpatch-through: 9.3
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@ -734,9 +734,9 @@ SELECT * FROM multiout_simple_setof(3);
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<title>Sharing Data</title>
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<para>
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The global dictionary <varname>SD</varname> is available to store
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data between function calls. This variable is private static data.
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private data between repeated calls to the same function.
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The global dictionary <varname>GD</varname> is public data,
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available to all Python functions within a session. Use with
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that is available to all Python functions within a session; use with
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care.<indexterm><primary>global data</>
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<secondary>in PL/Python</></indexterm>
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</para>
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