v3-0004-Implement-jsonpath-.boolean-and-.string-methods.patch

From 4aa731ebe57d1edc04caf332821341fd25e6a24f Mon Sep 17 00:00:00 2001
From: Jeevan Chalke <jeevan.chalke@enterprisedb.com>
Date: Mon, 6 Nov 2023 18:09:10 +0530
Subject: [PATCH v3 4/4] Implement jsonpath .boolean() and .string() methods

This commit implements jsonpath .boolean() and .string() methods.

.boolean() method converts the given JSON string, numeric, or boolean
value to the boolean type representation.  In the numeric case, only
integers are allowed, whereas we use the parse_bool() backend function
to convert string to a bool.

.string() method uses the datatype's out function to convert numeric
and various date/time types to the string representation.

Jeevan Chalke.
---
 doc/src/sgml/func.sgml                       |  32 ++++
 src/backend/catalog/sql_features.txt         |   4 +-
 src/backend/utils/adt/jsonpath.c             |  16 ++
 src/backend/utils/adt/jsonpath_exec.c        | 147 +++++++++++++++
 src/backend/utils/adt/jsonpath_gram.y        |   6 +-
 src/backend/utils/adt/jsonpath_scan.l        |   2 +
 src/include/utils/jsonpath.h                 |   2 +
 src/test/regress/expected/jsonb_jsonpath.out | 263 +++++++++++++++++++++++++++
 src/test/regress/expected/jsonpath.out       |  12 ++
 src/test/regress/sql/jsonb_jsonpath.sql      |  58 ++++++
 src/test/regress/sql/jsonpath.sql            |   2 +
 11 files changed, 541 insertions(+), 3 deletions(-)

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index cbaed1b..c878349 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -17672,6 +17672,38 @@ strict $.**.HR
 
       <row>
        <entry role="func_table_entry"><para role="func_signature">
+        <replaceable>value</replaceable> <literal>.</literal> <literal>boolean()</literal>
+        <returnvalue><replaceable>boolean</replaceable></returnvalue>
+       </para>
+       <para>
+        Boolean value converted from a JSON boolean, number, or string
+       </para>
+       <para>
+        <literal>jsonb_path_query_array('[1, "yes", false]', '$[*].boolean()')</literal>
+        <returnvalue>[true, true, false]</returnvalue>
+       </para></entry>
+      </row>
+
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
+        <replaceable>value</replaceable> <literal>.</literal> <literal>string()</literal>
+        <returnvalue><replaceable>string</replaceable></returnvalue>
+       </para>
+       <para>
+        String value converted from a JSON boolean, number, string, or datetime
+       </para>
+       <para>
+        <literal>jsonb_path_query_array('[1.23, "xyz", false]', '$[*].string()')</literal>
+        <returnvalue>["1.23", "xyz", "false"]</returnvalue>
+       </para>
+       <para>
+        <literal>jsonb_path_query('"2023-08-15"', '$.datetime().string()')</literal>
+        <returnvalue>"2023-08-15"</returnvalue>
+       </para></entry>
+      </row>
+
+      <row>
+       <entry role="func_table_entry"><para role="func_signature">
         <replaceable>value</replaceable> <literal>.</literal> <literal>double()</literal>
         <returnvalue><replaceable>number</replaceable></returnvalue>
        </para>
diff --git a/src/backend/catalog/sql_features.txt b/src/backend/catalog/sql_features.txt
index aa80634..4085a2d 100644
--- a/src/backend/catalog/sql_features.txt
+++ b/src/backend/catalog/sql_features.txt
@@ -575,13 +575,13 @@ T862	SQL/JSON simplified accessor: wildcard member accessor			NO
 T863	SQL/JSON simplified accessor: single-quoted string literal as member accessor			NO	
 T864	SQL/JSON simplified accessor			NO	
 T865	SQL/JSON item method: bigint()			YES	
-T866	SQL/JSON item method: boolean()			NO	
+T866	SQL/JSON item method: boolean()			YES	
 T867	SQL/JSON item method: date()			YES	
 T868	SQL/JSON item method: decimal()			YES	
 T869	SQL/JSON item method: decimal() with precision and scale			YES	
 T870	SQL/JSON item method: integer()			YES	
 T871	SQL/JSON item method: number()			YES	
-T872	SQL/JSON item method: string()			NO	
+T872	SQL/JSON item method: string()			YES	
 T873	SQL/JSON item method: time()			YES	
 T874	SQL/JSON item method: time_tz()			YES	
 T875	SQL/JSON item method: time precision			YES	
diff --git a/src/backend/utils/adt/jsonpath.c b/src/backend/utils/adt/jsonpath.c
index 2ebd11c..19cf79d 100644
--- a/src/backend/utils/adt/jsonpath.c
+++ b/src/backend/utils/adt/jsonpath.c
@@ -444,6 +444,8 @@ flattenJsonPathParseItem(StringInfo buf, int *result, struct Node *escontext,
 			break;
 		case jpiType:
 		case jpiSize:
+		case jpiBoolean:
+		case jpiStringFunc:
 		case jpiDouble:
 		case jpiNumber:
 		case jpiBigint:
@@ -727,6 +729,12 @@ printJsonPathItem(StringInfo buf, JsonPathItem *v, bool inKey,
 		case jpiSize:
 			appendStringInfoString(buf, ".size()");
 			break;
+		case jpiBoolean:
+			appendStringInfoString(buf, ".boolean()");
+			break;
+		case jpiStringFunc:
+			appendStringInfoString(buf, ".string()");
+			break;
 		case jpiDouble:
 			appendStringInfoString(buf, ".double()");
 			break;
@@ -859,6 +867,10 @@ jspOperationName(JsonPathItemType type)
 			return "type";
 		case jpiSize:
 			return "size";
+		case jpiBoolean:
+			return "boolean";
+		case jpiStringFunc:
+			return "string";
 		case jpiDouble:
 			return "double";
 		case jpiNumber:
@@ -983,6 +995,8 @@ jspInitByBuffer(JsonPathItem *v, char *base, int32 pos)
 		case jpiAnyKey:
 		case jpiType:
 		case jpiSize:
+		case jpiBoolean:
+		case jpiStringFunc:
 		case jpiDouble:
 		case jpiNumber:
 		case jpiBigint:
@@ -1111,6 +1125,8 @@ jspGetNext(JsonPathItem *v, JsonPathItem *a)
 			   v->type == jpiMod ||
 			   v->type == jpiType ||
 			   v->type == jpiSize ||
+			   v->type == jpiBoolean ||
+			   v->type == jpiStringFunc ||
 			   v->type == jpiDouble ||
 			   v->type == jpiNumber ||
 			   v->type == jpiDecimal ||
diff --git a/src/backend/utils/adt/jsonpath_exec.c b/src/backend/utils/adt/jsonpath_exec.c
index deeee76..62571f7 100644
--- a/src/backend/utils/adt/jsonpath_exec.c
+++ b/src/backend/utils/adt/jsonpath_exec.c
@@ -1021,6 +1021,153 @@ executeItemOptUnwrapTarget(JsonPathExecContext *cxt, JsonPathItem *jsp,
 			}
 			break;
 
+		case jpiBoolean:
+			{
+				JsonbValue	jbv;
+				bool		bval;
+
+				if (unwrap && JsonbType(jb) == jbvArray)
+					return executeItemUnwrapTargetArray(cxt, jsp, jb, found,
+														false);
+
+				if (jb->type == jbvBool)
+				{
+					bval = jb->val.boolean;
+
+					res = jperOk;
+				}
+				else if (jb->type == jbvNumeric)
+				{
+					int			ival;
+					Datum		datum;
+					bool		noerr;
+					char	   *tmp = DatumGetCString(DirectFunctionCall1(numeric_out,
+																		  NumericGetDatum(jb->val.numeric)));
+					ErrorSaveContext escontext = {T_ErrorSaveContext};
+
+					noerr = DirectInputFunctionCallSafe(int4in, tmp,
+														InvalidOid, -1,
+														(Node *) &escontext,
+														&datum);
+
+					if (!noerr || escontext.error_occurred)
+						RETURN_ERROR(ereport(ERROR,
+											 (errcode(ERRCODE_NON_NUMERIC_SQL_JSON_ITEM),
+											  errmsg("numeric argument of jsonpath item method .%s() is out of range for type boolean",
+													 jspOperationName(jsp->type)))));
+
+					ival = DatumGetInt32(datum);
+					if (ival == 0)
+						bval = false;
+					else
+						bval = true;
+
+					res = jperOk;
+				}
+				else if (jb->type == jbvString)
+				{
+					/* cast string as boolean */
+					char	   *tmp = pnstrdup(jb->val.string.val,
+											   jb->val.string.len);
+
+					if (!parse_bool(tmp, &bval))
+						RETURN_ERROR(ereport(ERROR,
+											 (errcode(ERRCODE_NON_NUMERIC_SQL_JSON_ITEM),
+											  errmsg("string argument of jsonpath item method .%s() is not a valid representation of a boolean",
+													 jspOperationName(jsp->type)))));
+
+					res = jperOk;
+				}
+
+				if (res == jperNotFound)
+					RETURN_ERROR(ereport(ERROR,
+										 (errcode(ERRCODE_NON_NUMERIC_SQL_JSON_ITEM),
+										  errmsg("jsonpath item method .%s() can only be applied to a bool, string, or numeric value",
+												 jspOperationName(jsp->type)))));
+
+				jb = &jbv;
+				jb->type = jbvBool;
+				jb->val.boolean = bval;
+
+				res = executeNextItem(cxt, jsp, NULL, jb, found, true);
+			}
+			break;
+
+		case jpiStringFunc:
+			{
+				JsonbValue	jbv;
+				char	   *tmp = NULL;
+
+				switch (JsonbType(jb))
+				{
+					case jbvString:
+						/*
+						 * Value is not necessarily null-terminated, so we do
+						 * pnstrdup() here.
+						 */
+						tmp = pnstrdup(jb->val.string.val,
+									   jb->val.string.len);
+						break;
+					case jbvNumeric:
+						tmp = DatumGetCString(DirectFunctionCall1(numeric_out,
+																  NumericGetDatum(jb->val.numeric)));
+						break;
+					case jbvBool:
+						tmp = (jb->val.boolean) ? "true" : "false";
+						break;
+					case jbvDatetime:
+						{
+							switch (jb->val.datetime.typid)
+							{
+								case DATEOID:
+									tmp = DatumGetCString(DirectFunctionCall1(date_out,
+																			  jb->val.datetime.value));
+									break;
+								case TIMEOID:
+									tmp = DatumGetCString(DirectFunctionCall1(time_out,
+																			  jb->val.datetime.value));
+									break;
+								case TIMETZOID:
+									tmp = DatumGetCString(DirectFunctionCall1(timetz_out,
+																			  jb->val.datetime.value));
+									break;
+								case TIMESTAMPOID:
+									tmp = DatumGetCString(DirectFunctionCall1(timestamp_out,
+																			  jb->val.datetime.value));
+									break;
+								case TIMESTAMPTZOID:
+									tmp = DatumGetCString(DirectFunctionCall1(timestamptz_out,
+																			  jb->val.datetime.value));
+									break;
+								default:
+									elog(ERROR, "unrecognized SQL/JSON datetime type oid: %u",
+										 jb->val.datetime.typid);
+							}
+						}
+						break;
+					case jbvNull:
+					case jbvArray:
+					case jbvObject:
+					case jbvBinary:
+						RETURN_ERROR(ereport(ERROR,
+											 (errcode(ERRCODE_NON_NUMERIC_SQL_JSON_ITEM),
+											  errmsg("jsonpath item method .%s() can only be applied to a bool, string, numeric, or datetime value",
+													 jspOperationName(jsp->type)))));
+						break;
+				}
+
+				res = jperOk;
+
+				jb = &jbv;
+				Assert(tmp != NULL);		/* We must have set tmp above */
+				jb->val.string.val = (jb->type == jbvString) ? tmp : pstrdup(tmp);
+				jb->val.string.len = strlen(jb->val.string.val);
+				jb->type = jbvString;
+
+				res = executeNextItem(cxt, jsp, NULL, jb, found, true);
+			}
+			break;
+
 		case jpiDouble:
 			{
 				JsonbValue	jbv;
diff --git a/src/backend/utils/adt/jsonpath_gram.y b/src/backend/utils/adt/jsonpath_gram.y
index 7162d37..eee16cc 100644
--- a/src/backend/utils/adt/jsonpath_gram.y
+++ b/src/backend/utils/adt/jsonpath_gram.y
@@ -80,7 +80,7 @@ static bool makeItemLikeRegex(JsonPathParseItem *expr,
 %token	<str>		OR_P AND_P NOT_P
 %token	<str>		LESS_P LESSEQUAL_P EQUAL_P NOTEQUAL_P GREATEREQUAL_P GREATER_P
 %token	<str>		ANY_P STRICT_P LAX_P LAST_P STARTS_P WITH_P LIKE_REGEX_P FLAG_P
-%token	<str>		TYPE_P SIZE_P
+%token	<str>		TYPE_P SIZE_P BOOLEAN_P STRINGFUNC_P
 %token	<str>		DOUBLE_P NUMBER_P DECIMAL_P BIGINT_P INTEGER_P
 %token	<str>		ABS_P CEILING_P FLOOR_P KEYVALUE_P
 %token	<str>		DATETIME_P DATE_P TIME_P TIME_TZ_P TIMESTAMP_P TIMESTAMP_TZ_P
@@ -339,6 +339,8 @@ key_name:
 	| FLAG_P
 	| TYPE_P
 	| SIZE_P
+	| BOOLEAN_P
+	| STRINGFUNC_P
 	| DOUBLE_P
 	| NUMBER_P
 	| DECIMAL_P
@@ -362,6 +364,8 @@ key_name:
 method:
 	TYPE_P							{ $$ = jpiType; }
 	| SIZE_P						{ $$ = jpiSize; }
+	| BOOLEAN_P						{ $$ = jpiBoolean; }
+	| STRINGFUNC_P					{ $$ = jpiStringFunc; }
 	| DOUBLE_P						{ $$ = jpiDouble; }
 	| NUMBER_P						{ $$ = jpiNumber; }
 	| BIGINT_P						{ $$ = jpiBigint; }
diff --git a/src/backend/utils/adt/jsonpath_scan.l b/src/backend/utils/adt/jsonpath_scan.l
index 6a7d72a..d87da14 100644
--- a/src/backend/utils/adt/jsonpath_scan.l
+++ b/src/backend/utils/adt/jsonpath_scan.l
@@ -418,6 +418,8 @@ static const JsonPathKeyword keywords[] = {
 	{ 6, false,	NUMBER_P,	"number"},
 	{ 6, false,	STARTS_P,	"starts"},
 	{ 6, false,	STRICT_P,	"strict"},
+	{ 6, false,	STRINGFUNC_P, "string"},
+	{ 7, false,	BOOLEAN_P,	"boolean"},
 	{ 7, false,	CEILING_P,	"ceiling"},
 	{ 7, false,	DECIMAL_P,	"decimal"},
 	{ 7, false,	INTEGER_P,	"integer"},
diff --git a/src/include/utils/jsonpath.h b/src/include/utils/jsonpath.h
index 5577086..92989c8 100644
--- a/src/include/utils/jsonpath.h
+++ b/src/include/utils/jsonpath.h
@@ -91,6 +91,8 @@ typedef enum JsonPathItemType
 	jpiMod,						/* expr % expr */
 	jpiType,					/* .type() item method */
 	jpiSize,					/* .size() item method */
+	jpiBoolean,					/* .boolean() item method */
+	jpiStringFunc,				/* .string() item method */
 	jpiDouble,					/* .double() item method */
 	jpiNumber,					/* .number() item method */
 	jpiDecimal,					/* .decimal() item method */
diff --git a/src/test/regress/expected/jsonb_jsonpath.out b/src/test/regress/expected/jsonb_jsonpath.out
index 0231265..f07eb90 100644
--- a/src/test/regress/expected/jsonb_jsonpath.out
+++ b/src/test/regress/expected/jsonb_jsonpath.out
@@ -1348,6 +1348,269 @@ select jsonb_path_query('[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]', 'l
  1
 (9 rows)
 
+select jsonb_path_query('null', '$.boolean()');
+ERROR:  jsonpath item method .boolean() can only be applied to a bool, string, or numeric value
+select jsonb_path_query('null', '$.boolean()', silent => true);
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[]', '$.boolean()');
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[]', 'strict $.boolean()');
+ERROR:  jsonpath item method .boolean() can only be applied to a bool, string, or numeric value
+select jsonb_path_query('{}', '$.boolean()');
+ERROR:  jsonpath item method .boolean() can only be applied to a bool, string, or numeric value
+select jsonb_path_query('[]', 'strict $.boolean()', silent => true);
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{}', '$.boolean()', silent => true);
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('1.23', '$.boolean()');
+ERROR:  numeric argument of jsonpath item method .boolean() is out of range for type boolean
+select jsonb_path_query('"1.23"', '$.boolean()');
+ERROR:  string argument of jsonpath item method .boolean() is not a valid representation of a boolean
+select jsonb_path_query('"1.23aaa"', '$.boolean()');
+ERROR:  string argument of jsonpath item method .boolean() is not a valid representation of a boolean
+select jsonb_path_query('1e1000', '$.boolean()');
+ERROR:  numeric argument of jsonpath item method .boolean() is out of range for type boolean
+select jsonb_path_query('"nan"', '$.boolean()');
+ERROR:  string argument of jsonpath item method .boolean() is not a valid representation of a boolean
+select jsonb_path_query('"NaN"', '$.boolean()');
+ERROR:  string argument of jsonpath item method .boolean() is not a valid representation of a boolean
+select jsonb_path_query('"inf"', '$.boolean()');
+ERROR:  string argument of jsonpath item method .boolean() is not a valid representation of a boolean
+select jsonb_path_query('"-inf"', '$.boolean()');
+ERROR:  string argument of jsonpath item method .boolean() is not a valid representation of a boolean
+select jsonb_path_query('"inf"', '$.boolean()', silent => true);
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('"-inf"', '$.boolean()', silent => true);
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('"100"', '$.boolean()');
+ERROR:  string argument of jsonpath item method .boolean() is not a valid representation of a boolean
+select jsonb_path_query('true', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('false', '$.boolean()');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('1', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('0', '$.boolean()');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('-1', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('100', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('"1"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('"0"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('"true"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('"false"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('"TRUE"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('"FALSE"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('"yes"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('"NO"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('"T"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('"f"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('"y"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ true
+(1 row)
+
+select jsonb_path_query('"N"', '$.boolean()');
+ jsonb_path_query 
+------------------
+ false
+(1 row)
+
+select jsonb_path_query('true', '$.boolean().type()');
+ jsonb_path_query 
+------------------
+ "boolean"
+(1 row)
+
+select jsonb_path_query('123', '$.boolean().type()');
+ jsonb_path_query 
+------------------
+ "boolean"
+(1 row)
+
+select jsonb_path_query('"Yes"', '$.boolean().type()');
+ jsonb_path_query 
+------------------
+ "boolean"
+(1 row)
+
+select jsonb_path_query_array('[1, "yes", false]', '$[*].boolean()');
+ jsonb_path_query_array 
+------------------------
+ [true, true, false]
+(1 row)
+
+select jsonb_path_query('null', '$.string()');
+ERROR:  jsonpath item method .string() can only be applied to a bool, string, numeric, or datetime value
+select jsonb_path_query('null', '$.string()', silent => true);
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('[]', '$.string()');
+ERROR:  jsonpath item method .string() can only be applied to a bool, string, numeric, or datetime value
+select jsonb_path_query('[]', 'strict $.string()');
+ERROR:  jsonpath item method .string() can only be applied to a bool, string, numeric, or datetime value
+select jsonb_path_query('{}', '$.string()');
+ERROR:  jsonpath item method .string() can only be applied to a bool, string, numeric, or datetime value
+select jsonb_path_query('[]', 'strict $.string()', silent => true);
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('{}', '$.string()', silent => true);
+ jsonb_path_query 
+------------------
+(0 rows)
+
+select jsonb_path_query('1.23', '$.string()');
+ jsonb_path_query 
+------------------
+ "1.23"
+(1 row)
+
+select jsonb_path_query('"1.23"', '$.string()');
+ jsonb_path_query 
+------------------
+ "1.23"
+(1 row)
+
+select jsonb_path_query('"1.23aaa"', '$.string()');
+ jsonb_path_query 
+------------------
+ "1.23aaa"
+(1 row)
+
+select jsonb_path_query('1234', '$.string()');
+ jsonb_path_query 
+------------------
+ "1234"
+(1 row)
+
+select jsonb_path_query('true', '$.string()');
+ jsonb_path_query 
+------------------
+ "true"
+(1 row)
+
+select jsonb_path_query('1234', '$.string().type()');
+ jsonb_path_query 
+------------------
+ "string"
+(1 row)
+
+select jsonb_path_query('"2023-08-15 12:34:56 +5:30"', '$.timestamp().string()');
+      jsonb_path_query      
+----------------------------
+ "Tue Aug 15 00:04:56 2023"
+(1 row)
+
+select jsonb_path_query_array('[1.23, "yes", false]', '$[*].string()');
+  jsonb_path_query_array  
+--------------------------
+ ["1.23", "yes", "false"]
+(1 row)
+
+select jsonb_path_query_array('[1.23, "yes", false]', '$[*].string().type()');
+     jsonb_path_query_array     
+--------------------------------
+ ["string", "string", "string"]
+(1 row)
+
 select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].abs()');
  jsonb_path_query 
 ------------------
diff --git a/src/test/regress/expected/jsonpath.out b/src/test/regress/expected/jsonpath.out
index b47b2e9..6b16cda 100644
--- a/src/test/regress/expected/jsonpath.out
+++ b/src/test/regress/expected/jsonpath.out
@@ -381,6 +381,18 @@ select 'true.type()'::jsonpath;
  true.type()
 (1 row)
 
+select '$.boolean()'::jsonpath;
+  jsonpath   
+-------------
+ $.boolean()
+(1 row)
+
+select '$.string()'::jsonpath;
+  jsonpath  
+------------
+ $.string()
+(1 row)
+
 select '$.double().floor().ceiling().abs()'::jsonpath;
               jsonpath              
 ------------------------------------
diff --git a/src/test/regress/sql/jsonb_jsonpath.sql b/src/test/regress/sql/jsonb_jsonpath.sql
index 06a9548..c10fb2b 100644
--- a/src/test/regress/sql/jsonb_jsonpath.sql
+++ b/src/test/regress/sql/jsonb_jsonpath.sql
@@ -283,6 +283,64 @@ select jsonb_path_query('[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]', 's
 select jsonb_path_query('[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]', 'strict $[*].size()', silent => true);
 select jsonb_path_query('[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]', 'lax $[*].size()');
 
+select jsonb_path_query('null', '$.boolean()');
+select jsonb_path_query('null', '$.boolean()', silent => true);
+select jsonb_path_query('[]', '$.boolean()');
+select jsonb_path_query('[]', 'strict $.boolean()');
+select jsonb_path_query('{}', '$.boolean()');
+select jsonb_path_query('[]', 'strict $.boolean()', silent => true);
+select jsonb_path_query('{}', '$.boolean()', silent => true);
+select jsonb_path_query('1.23', '$.boolean()');
+select jsonb_path_query('"1.23"', '$.boolean()');
+select jsonb_path_query('"1.23aaa"', '$.boolean()');
+select jsonb_path_query('1e1000', '$.boolean()');
+select jsonb_path_query('"nan"', '$.boolean()');
+select jsonb_path_query('"NaN"', '$.boolean()');
+select jsonb_path_query('"inf"', '$.boolean()');
+select jsonb_path_query('"-inf"', '$.boolean()');
+select jsonb_path_query('"inf"', '$.boolean()', silent => true);
+select jsonb_path_query('"-inf"', '$.boolean()', silent => true);
+select jsonb_path_query('"100"', '$.boolean()');
+select jsonb_path_query('true', '$.boolean()');
+select jsonb_path_query('false', '$.boolean()');
+select jsonb_path_query('1', '$.boolean()');
+select jsonb_path_query('0', '$.boolean()');
+select jsonb_path_query('-1', '$.boolean()');
+select jsonb_path_query('100', '$.boolean()');
+select jsonb_path_query('"1"', '$.boolean()');
+select jsonb_path_query('"0"', '$.boolean()');
+select jsonb_path_query('"true"', '$.boolean()');
+select jsonb_path_query('"false"', '$.boolean()');
+select jsonb_path_query('"TRUE"', '$.boolean()');
+select jsonb_path_query('"FALSE"', '$.boolean()');
+select jsonb_path_query('"yes"', '$.boolean()');
+select jsonb_path_query('"NO"', '$.boolean()');
+select jsonb_path_query('"T"', '$.boolean()');
+select jsonb_path_query('"f"', '$.boolean()');
+select jsonb_path_query('"y"', '$.boolean()');
+select jsonb_path_query('"N"', '$.boolean()');
+select jsonb_path_query('true', '$.boolean().type()');
+select jsonb_path_query('123', '$.boolean().type()');
+select jsonb_path_query('"Yes"', '$.boolean().type()');
+select jsonb_path_query_array('[1, "yes", false]', '$[*].boolean()');
+
+select jsonb_path_query('null', '$.string()');
+select jsonb_path_query('null', '$.string()', silent => true);
+select jsonb_path_query('[]', '$.string()');
+select jsonb_path_query('[]', 'strict $.string()');
+select jsonb_path_query('{}', '$.string()');
+select jsonb_path_query('[]', 'strict $.string()', silent => true);
+select jsonb_path_query('{}', '$.string()', silent => true);
+select jsonb_path_query('1.23', '$.string()');
+select jsonb_path_query('"1.23"', '$.string()');
+select jsonb_path_query('"1.23aaa"', '$.string()');
+select jsonb_path_query('1234', '$.string()');
+select jsonb_path_query('true', '$.string()');
+select jsonb_path_query('1234', '$.string().type()');
+select jsonb_path_query('"2023-08-15 12:34:56 +5:30"', '$.timestamp().string()');
+select jsonb_path_query_array('[1.23, "yes", false]', '$[*].string()');
+select jsonb_path_query_array('[1.23, "yes", false]', '$[*].string().type()');
+
 select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].abs()');
 select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].floor()');
 select jsonb_path_query('[0, 1, -2, -3.4, 5.6]', '$[*].ceiling()');
diff --git a/src/test/regress/sql/jsonpath.sql b/src/test/regress/sql/jsonpath.sql
index 44275c9..8f07b71 100644
--- a/src/test/regress/sql/jsonpath.sql
+++ b/src/test/regress/sql/jsonpath.sql
@@ -69,6 +69,8 @@ select '(1).type()'::jsonpath;
 select '1.2.type()'::jsonpath;
 select '"aaa".type()'::jsonpath;
 select 'true.type()'::jsonpath;
+select '$.boolean()'::jsonpath;
+select '$.string()'::jsonpath;
 select '$.double().floor().ceiling().abs()'::jsonpath;
 select '$.bigint().integer().number().decimal()'::jsonpath;
 select '$.decimal(4,2)'::jsonpath;
-- 
1.8.3.1