Replace locate udf with SqlStdOperatorTable.POSITION

Signed-off-by: Yuanchun Shen <yuanchu@amazon.com>

Author: yuancu

core/src/main/java/org/opensearch/sql/expression/function/PPLBuiltinOperators.java

@@ -51,7 +51,6 @@
 import org.opensearch.sql.expression.function.udf.math.DivideFunction;
 import org.opensearch.sql.expression.function.udf.math.EulerFunction;
 import org.opensearch.sql.expression.function.udf.math.ModFunction;
-import org.opensearch.sql.expression.function.udf.text.LocateFunction;
 
 /** Defines functions and operators that are implemented only by PPL */
 public class PPLBuiltinOperators extends ReflectiveSqlOperatorTable {
@@ -64,9 +63,6 @@ public class PPLBuiltinOperators extends ReflectiveSqlOperatorTable {
   public static final SqlOperator CRC32 = new CRC32Function().toUDF("CRC32");
   public static final SqlOperator DIVIDE = new DivideFunction().toUDF("DIVIDE");
 
-  // Text function
-  public static final SqlOperator LOCATE = new LocateFunction().toUDF("LOCATE");
-
   // Datetime function
   public static final SqlOperator TIMESTAMP = new TimestampFunction().toUDF("TIMESTAMP");
   public static final SqlOperator DATE =

core/src/main/java/org/opensearch/sql/expression/function/PPLFuncImpTable.java

@@ -171,6 +171,7 @@ void populate() {
       registerOperator(LENGTH, SqlStdOperatorTable.CHAR_LENGTH);
       registerOperator(LOWER, SqlStdOperatorTable.LOWER);
       registerOperator(POSITION, SqlStdOperatorTable.POSITION);
+      registerOperator(LOCATE, SqlStdOperatorTable.POSITION);
       registerOperator(REPLACE, SqlStdOperatorTable.REPLACE);
       registerOperator(SUBSTRING, SqlStdOperatorTable.SUBSTRING);
       registerOperator(SUBSTR, SqlStdOperatorTable.SUBSTRING);
@@ -224,7 +225,6 @@ void populate() {
       registerOperator(MODULUSFUNCTION, PPLBuiltinOperators.MOD);
       registerOperator(CRC32, PPLBuiltinOperators.CRC32);
       registerOperator(DIVIDE, PPLBuiltinOperators.DIVIDE);
-      registerOperator(LOCATE, PPLBuiltinOperators.LOCATE);
 
       // Register PPL Datetime UDF operator
       registerOperator(TIMESTAMP, PPLBuiltinOperators.TIMESTAMP);