sunchao commented on code in PR #36616:
URL: https://github.com/apache/spark/pull/36616#discussion_r909243646
##########
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/ColumnVectorUtils.java:
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@@ -235,4 +291,37 @@ public static ColumnarBatch toBatch(
batch.setNumRows(n);
return batch;
}
+
+ /**
+ * <b>This method assumes that all constant column are at the end of schema
+ * and `constantColumnLength` represents the number of constant column.<b/>
+ *
+ * This method allocates columns to store elements of each field of the
schema,
+ * the data columns use `OffHeapColumnVector` when `useOffHeap` is true and
+ * use `OnHeapColumnVector` when `useOffHeap` is false, the constant columns
+ * always use `ConstantColumnVector`.
+ *
+ * Capacity is the initial capacity of the vector, and it will grow as
necessary.
+ * Capacity is in number of elements, not number of bytes.
+ */
+ public static ColumnVector[] allocateColumns(
+ int capacity, StructType schema, boolean useOffHeap, int
constantColumnLength) {
Review Comment:
nit: 4 space indent here
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