arina-ielchiieva commented on a change in pull request #1797: DRILL-7278:
Refactor result set loader projection mechanism
URL: https://github.com/apache/drill/pull/1797#discussion_r289948150
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File path:
exec/vector/src/main/java/org/apache/drill/exec/record/metadata/ColumnMetadata.java
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@@ -51,19 +51,20 @@
*/
String FORMAT_PROP = DRILL_PROP_PREFIX + "format";
- /**
- * Indicates if the column is projected. Used only for internal
- * reader-provided schemas.
- */
- String PROJECTED_PROP = DRILL_PROP_PREFIX + "projected";
-
/**
* Indicates how to handle blanks. Must be one of the valid values defined
* in AbstractConvertFromString. Normally set on the converter by the plugin
* rather than by the user in the schema.
*/
String BLANK_AS_PROP = DRILL_PROP_PREFIX + "blank-as";
+ /**
+ * Indicates whether to project the column in a wildcard (*) query.
+ * Special columns may be excluded from projection. Certain "special"
+ * columns may be available only when explicitly requested.
+ */
+ String EXCLUDE_FROM_WILDCARD = DRILL_PROP_PREFIX + "special";
Review comment:
Could you please provide an example form the log reader? I did not quite
understand from the description.
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