zachjsh commented on code in PR #15469:
URL: https://github.com/apache/druid/pull/15469#discussion_r1418509963
##########
sql/src/main/java/org/apache/druid/sql/calcite/table/DatasourceTable.java:
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@@ -115,14 +137,107 @@ public String toString()
}
}
+ public static class EffectiveColumnMetadata
+ {
+ protected final String name;
+ protected final ColumnType type;
+
+ public EffectiveColumnMetadata(String name, ColumnType type)
+ {
+ this.name = name;
+ this.type = type;
+ }
+
+ public String name()
+ {
+ return name;
+ }
+
+ public ColumnType druidType()
+ {
+ return type;
+ }
+
+ public static EffectiveColumnMetadata fromPhysical(String name, ColumnType
type)
+ {
+ return new EffectiveColumnMetadata(name, type);
+ }
+
+ @Override
+ public String toString()
+ {
+ return "Column{" +
+ "name=" + name +
+ ", type=" + type.asTypeString() +
+ "}";
+ }
+ }
+
+ public static class EffectiveMetadata
+ {
+ private final DatasourceFacade catalogMetadata;
+ private final boolean isEmpty;
+ private final Map<String, EffectiveColumnMetadata> columns;
+
+ public EffectiveMetadata(
+ final DatasourceFacade catalogMetadata,
+ final Map<String, EffectiveColumnMetadata> columns,
+ final boolean isEmpty
+ )
+ {
+ this.catalogMetadata = catalogMetadata;
+ this.isEmpty = isEmpty;
+ this.columns = columns;
+ }
+
+ public DatasourceFacade catalogMetadata()
+ {
+ return catalogMetadata;
+ }
+
+ public EffectiveColumnMetadata column(String name)
+ {
+ return columns.get(name);
+ }
+
+ public boolean isEmpty()
Review Comment:
Does isEmpty signify whether or not the table had any data in it or not?
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