[SPARK-22452][SQL] Add getInt, getLong, getBoolean to DataSourceV2Options

- Implemented methods getInt, getLong, getBoolean for DataSourceV2Options
- Added new unit tests to exercise these methods

Author: Sunitha Kambhampati <skambha@us.ibm.com>

Closes #19902 from skambha/spark22452.

sql/core/src/main/java/org/apache/spark/sql/sources/v2/DataSourceV2Options.java

@@ -49,4 +49,35 @@ public class DataSourceV2Options {
   public Optional<String> get(String key) {
     return Optional.ofNullable(keyLowerCasedMap.get(toLowerCase(key)));
   }
+
+  /**
+   * Returns the boolean value to which the specified key is mapped,
+   * or defaultValue if there is no mapping for the key. The key match is case-insensitive
+   */
+  public boolean getBoolean(String key, boolean defaultValue) {
+    String lcaseKey = toLowerCase(key);
+    return keyLowerCasedMap.containsKey(lcaseKey) ?
+      Boolean.parseBoolean(keyLowerCasedMap.get(lcaseKey)) : defaultValue;
+  }
+
+  /**
+   * Returns the integer value to which the specified key is mapped,
+   * or defaultValue if there is no mapping for the key. The key match is case-insensitive
+   */
+  public int getInt(String key, int defaultValue) {
+    String lcaseKey = toLowerCase(key);
+    return keyLowerCasedMap.containsKey(lcaseKey) ?
+      Integer.parseInt(keyLowerCasedMap.get(lcaseKey)) : defaultValue;
+  }
+
+  /**
+   * Returns the long value to which the specified key is mapped,
+   * or defaultValue if there is no mapping for the key. The key match is case-insensitive
+   */
+  public long getLong(String key, long defaultValue) {
+    String lcaseKey = toLowerCase(key);
+    return keyLowerCasedMap.containsKey(lcaseKey) ?
+      Long.parseLong(keyLowerCasedMap.get(lcaseKey)) : defaultValue;
+  }
+
 }

sql/core/src/test/scala/org/apache/spark/sql/sources/v2/DataSourceV2OptionsSuite.scala

@@ -37,4 +37,35 @@ class DataSourceV2OptionsSuite extends SparkFunSuite {
     val options = new DataSourceV2Options(Map("foo" -> "bAr").asJava)
     assert(options.get("foo").get == "bAr")
   }
+
+  test("getInt") {
+    val options = new DataSourceV2Options(Map("numFOo" -> "1", "foo" -> "bar").asJava)
+    assert(options.getInt("numFOO", 10) == 1)
+    assert(options.getInt("numFOO2", 10) == 10)
+
+    intercept[NumberFormatException]{
+      options.getInt("foo", 1)
+    }
+  }
+
+  test("getBoolean") {
+    val options = new DataSourceV2Options(
+      Map("isFoo" -> "true", "isFOO2" -> "false", "foo" -> "bar").asJava)
+    assert(options.getBoolean("isFoo", false))
+    assert(!options.getBoolean("isFoo2", true))
+    assert(options.getBoolean("isBar", true))
+    assert(!options.getBoolean("isBar", false))
+    assert(!options.getBoolean("FOO", true))
+  }
+
+  test("getLong") {
+    val options = new DataSourceV2Options(Map("numFoo" -> "9223372036854775807",
+      "foo" -> "bar").asJava)
+    assert(options.getLong("numFOO", 0L) == 9223372036854775807L)
+    assert(options.getLong("numFoo2", -1L) == -1L)
+
+    intercept[NumberFormatException]{
+      options.getLong("foo", 0L)
+    }
+  }
 }