Issue #2939748 by msankhala, joachim: MigrateSourceInterface::getIds() doesn't clearly document what the 'alias' property does
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@ -87,10 +87,10 @@ interface MigrateSourceInterface extends \Countable, \Iterator, PluginInspection
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*
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* Additional custom keys/values that are not part of field storage
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* definition can be added as shown below. The most common setting
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* passed along to the ID definition is 'alias', used by the SqlBase source
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* plugin in order to distinguish between ambiguous column names - for
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* example, when a SQL source query joins two tables with the same column
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* names.
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* passed along to the ID definition is table 'alias', used by the SqlBase
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* source plugin in order to distinguish between ambiguous column names -
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* for example, when a SQL source query joins two tables with the same
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* column names.
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* @code
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* return [
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* 'nid' => [
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