[GitHub] spark issue #14322: [SPARK-16689] [SQL] FileSourceStrategy: Pruning Partitio...

[gatorsmile <gi...@git.apache.org>]

Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/14322
  
    **Before the PR changes**, the whole-stage codegen output is like:
    ```JAVA
    == Subtree 1 / 1 ==
    *Project [value#37L]
    +- *Scan json [value#37L,p1#39,p2#40,p3#41] Format: JSON, InputPaths: file:/private/var/folders/4b/sgmfldk15js406vk7lw5llzw0000gn/T/spark-f7a4294a-2e1b-4f44-9ebb-1a5eb..., PushedFilters: [], ReadSchema: struct<value:bigint>
    
    Generated code:
    /* 001 */ public Object generate(Object[] references) {
    /* 002 */   return new GeneratedIterator(references);
    /* 003 */ }
    /* 004 */
    /* 005 */ final class GeneratedIterator extends org.apache.spark.sql.execution.BufferedRowIterator {
    /* 006 */   private Object[] references;
    /* 007 */   private org.apache.spark.sql.execution.metric.SQLMetric scan_numOutputRows;
    /* 008 */   private scala.collection.Iterator scan_input;
    /* 009 */   private UnsafeRow project_result;
    /* 010 */   private org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder project_holder;
    /* 011 */   private org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter project_rowWriter;
    /* 012 */
    /* 013 */   public GeneratedIterator(Object[] references) {
    /* 014 */     this.references = references;
    /* 015 */   }
    /* 016 */
    /* 017 */   public void init(int index, scala.collection.Iterator inputs[]) {
    /* 018 */     partitionIndex = index;
    /* 019 */     this.scan_numOutputRows = (org.apache.spark.sql.execution.metric.SQLMetric) references[0];
    /* 020 */     scan_input = inputs[0];
    /* 021 */     project_result = new UnsafeRow(1);
    /* 022 */     this.project_holder = new org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder(project_result, 0);
    /* 023 */     this.project_rowWriter = new org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter(project_holder, 1);
    /* 024 */   }
    /* 025 */
    /* 026 */   protected void processNext() throws java.io.IOException {
    /* 027 */     while (scan_input.hasNext()) {
    /* 028 */       InternalRow scan_row = (InternalRow) scan_input.next();
    /* 029 */       scan_numOutputRows.add(1);
    /* 030 */       boolean scan_isNull4 = scan_row.isNullAt(0);
    /* 031 */       long scan_value4 = scan_isNull4 ? -1L : (scan_row.getLong(0));
    /* 032 */       project_rowWriter.zeroOutNullBytes();
    /* 033 */
    /* 034 */       if (scan_isNull4) {
    /* 035 */         project_rowWriter.setNullAt(0);
    /* 036 */       } else {
    /* 037 */         project_rowWriter.write(0, scan_value4);
    /* 038 */       }
    /* 039 */       append(project_result);
    /* 040 */       if (shouldStop()) return;
    /* 041 */     }
    /* 042 */   }
    /* 043 */ }
    ```



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