@Test
public void testComputeEmptyColumns() {
String fullColumn = "full";
String partialColumn = "partial";
String emptyColumn = "empty";
String val = "val";
Map<String, ColumnMetadata> columnMetadata =
ImmutableMap.of(
fullColumn,
new ColumnMetadata(fullColumn, Schema.STRING, fullColumn),
partialColumn,
new ColumnMetadata(partialColumn, Schema.STRING, partialColumn),
emptyColumn,
new ColumnMetadata(emptyColumn, Schema.STRING, emptyColumn));
TableAnswerElement table =
new TableAnswerElement(
new TableMetadata(
columnMetadata.values().stream().collect(ImmutableList.toImmutableList())));
table.addRow(Row.builder(columnMetadata).put(fullColumn, val).put(partialColumn, val).build());
table.addRow(Row.builder(columnMetadata).put(fullColumn, val).build());
assertThat(
AnswerMetadataUtil.computeEmptyColumns(table), equalTo(ImmutableSet.of(emptyColumn)));
}