spark3-extensions/src/test/java/org/apache/iceberg/spark/extensions/TestIcebergExpressions.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.iceberg.spark.extensions;

import java.math.BigDecimal;
import java.util.Map;
import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
import org.apache.spark.sql.Column;
import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.catalyst.expressions.IcebergTruncateTransform;
import org.junit.After;
import org.junit.Test;

public class TestIcebergExpressions extends SparkExtensionsTestBase {

  public TestIcebergExpressions(String catalogName, String implementation, Map<String, String> config) {
    super(catalogName, implementation, config);
  }

  @After
  public void removeTables() {
    sql("DROP TABLE IF EXISTS %s", tableName);
    sql("DROP VIEW IF EXISTS emp");
    sql("DROP VIEW IF EXISTS v");
  }

  @Test
  public void testTruncateExpressions() {
    sql("CREATE TABLE %s ( " +
        "  int_c INT, long_c LONG, dec_c DECIMAL(4, 2), str_c STRING, binary_c BINARY " +
        ") USING iceberg", tableName);

    sql("CREATE TEMPORARY VIEW emp " +
        "AS SELECT * FROM VALUES (101, 10001, 10.65, '101-Employee', CAST('1234' AS BINARY)) " +
        "AS EMP(int_c, long_c, dec_c, str_c, binary_c)");

    sql("INSERT INTO %s SELECT * FROM emp", tableName);

    Dataset<Row> df = spark.sql("SELECT * FROM " + tableName);
    df.select(
        new Column(new IcebergTruncateTransform(df.col("int_c").expr(), 2)).as("int_c"),
        new Column(new IcebergTruncateTransform(df.col("long_c").expr(), 2)).as("long_c"),
        new Column(new IcebergTruncateTransform(df.col("dec_c").expr(), 50)).as("dec_c"),
        new Column(new IcebergTruncateTransform(df.col("str_c").expr(), 2)).as("str_c"),
        new Column(new IcebergTruncateTransform(df.col("binary_c").expr(), 2)).as("binary_c")
    ).createOrReplaceTempView("v");

    assertEquals("Should have expected rows",
        ImmutableList.of(row(100, 10000L, new BigDecimal("10.50"), "10", "12")),
        sql("SELECT int_c, long_c, dec_c, str_c, CAST(binary_c AS STRING) FROM v"));
  }
}