[tarantool-patches] [PATCH v2 2/6] sql: fix "PRAGMA parser_trace" result

[imeevma@tarantool.org]

Currently PRAGMA parser_trace returns an empty table. This seems
wrong, since other similar pragmas return their status. Fixed in
the current patch.

Part of #3832
---
 src/box/sql/pragma.c     | 20 +++++++++++++-------
 src/box/sql/pragma.h     |  4 ++--
 src/box/sql/sqliteInt.h  |  2 ++
 test/sql/errinj.result   | 19 +++++++++++++++++++
 test/sql/errinj.test.lua | 16 ++++++++++++++++
 5 files changed, 52 insertions(+), 9 deletions(-)

diff --git a/src/box/sql/pragma.c b/src/box/sql/pragma.c
index c052015..1fe5b3e 100644
--- a/src/box/sql/pragma.c
+++ b/src/box/sql/pragma.c
@@ -568,15 +568,21 @@ sqlite3Pragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
 	}
 #ifndef NDEBUG
 	case PragTyp_PARSER_TRACE:{
-			if (zRight) {
-				if (sqlite3GetBoolean(zRight, 0)) {
-					sqlite3ParserTrace(stdout, "parser: ");
-				} else {
-					sqlite3ParserTrace(0, 0);
-				}
+		int mask = pPragma->iArg;
+		if (zRight == NULL) {
+			returnSingleInt(v,
+					(user_session->sql_flags & mask) != 0);
+		} else {
+			if (sqlite3GetBoolean(zRight, 0)) {
+				sqlite3ParserTrace(stdout, "parser: ");
+				user_session->sql_flags |= mask;
+			} else {
+				sqlite3ParserTrace(0, 0);
+				user_session->sql_flags &= ~mask;
 			}
-			break;
 		}
+		break;
+	}
 #endif
 
 		/*
diff --git a/src/box/sql/pragma.h b/src/box/sql/pragma.h
index 84ab478..59e0e1e 100644
--- a/src/box/sql/pragma.h
+++ b/src/box/sql/pragma.h
@@ -138,9 +138,9 @@ static const PragmaName aPragmaName[] = {
 #if defined(SQLITE_DEBUG)
 	{ /* zName:     */ "parser_trace",
 	 /* ePragTyp:  */ PragTyp_PARSER_TRACE,
-	 /* ePragFlg:  */ 0,
+	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
 	 /* ColNames:  */ 0, 0,
-	 /* iArg:      */ 0},
+	 /* iArg:      */ SQLITE_ParserTrace},
 #endif
 	{ /* zName:     */ "query_only",
 	 /* ePragTyp:  */ PragTyp_FLAG,
diff --git a/src/box/sql/sqliteInt.h b/src/box/sql/sqliteInt.h
index 1ec52b8..3d4dead 100644
--- a/src/box/sql/sqliteInt.h
+++ b/src/box/sql/sqliteInt.h
@@ -1563,6 +1563,8 @@ struct sqlite3 {
  * Possible values for the sqlite3.flags.
  */
 #define SQLITE_VdbeTrace      0x00000001	/* True to trace VDBE execution */
+/* Debug print info about SQL query as it parsed */
+#define SQLITE_ParserTrace    0x00000002
 #define SQLITE_FullColNames   0x00000004	/* Show full column names on SELECT */
 #define SQLITE_ShortColNames  0x00000040	/* Show short columns names */
 #define SQLITE_CountRows      0x00000080	/* Count rows changed by INSERT, */
diff --git a/test/sql/errinj.result b/test/sql/errinj.result
index cb993f8..6ba7e72 100644
--- a/test/sql/errinj.result
+++ b/test/sql/errinj.result
@@ -280,3 +280,22 @@ errinj.set("ERRINJ_WAL_IO", false)
 box.sql.execute("DROP TABLE t3;")
 ---
 ...
+--
+-- gh-3832: Some statements do not return column type
+-- This test placed here because it should be skipped in release
+-- build.
+-- Check that "PRAGMA parser_trace" returns 0 or 1 if called
+-- without parameter.
+result = box.sql.execute('PRAGMA parser_trace')
+---
+...
+-- Should be TRUE.
+result[1][1] == 0 or result[1][1] == 1
+---
+- true
+...
+-- Check that "PRAGMA parser_trace" returns nothing if called
+-- with parameter.
+box.sql.execute('PRAGMA parser_trace = '.. result[1][1])
+---
+...
diff --git a/test/sql/errinj.test.lua b/test/sql/errinj.test.lua
index fa7f9f2..a938eda 100644
--- a/test/sql/errinj.test.lua
+++ b/test/sql/errinj.test.lua
@@ -97,3 +97,19 @@ box.sql.execute("ALTER TABLE t3 DROP CONSTRAINT fk1;")
 box.sql.execute("INSERT INTO t3 VALUES(1, 1, 3);")
 errinj.set("ERRINJ_WAL_IO", false)
 box.sql.execute("DROP TABLE t3;")
+
+--
+-- gh-3832: Some statements do not return column type
+
+-- This test placed here because it should be skipped in release
+-- build.
+
+-- Check that "PRAGMA parser_trace" returns 0 or 1 if called
+-- without parameter.
+result = box.sql.execute('PRAGMA parser_trace')
+-- Should be TRUE.
+result[1][1] == 0 or result[1][1] == 1
+
+-- Check that "PRAGMA parser_trace" returns nothing if called
+-- with parameter.
+box.sql.execute('PRAGMA parser_trace = '.. result[1][1])
-- 
2.7.4