[tarantool-patches] [PATCH v5 6/6] sql: set column types for EXPLAIN and PRAGMA

imeevma at tarantool.org imeevma at tarantool.org
Tue Jan 29 17:29:45 MSK 2019


Currently, EXPLAIN and PRAGMA do not set the column types for the
result. This is incorrect, since any returned row must have a
column type. This patch defines the types for these columns.

Closes #3832
---
 src/box/execute.c        |   5 +-
 src/box/sql/pragma.c     |  35 +++-----
 src/box/sql/pragma.h     | 214 +++++++++++++++++++++++++++++++++--------------
 src/box/sql/prepare.c    |  52 ++++++++----
 test/sql/iproto.result   |  69 +++++++++++++++
 test/sql/iproto.test.lua |  18 +++-
 6 files changed, 293 insertions(+), 100 deletions(-)

diff --git a/src/box/execute.c b/src/box/execute.c
index 7fff5fd..201d9c1 100644
--- a/src/box/execute.c
+++ b/src/box/execute.c
@@ -482,11 +482,12 @@ sql_get_description(struct sqlite3_stmt *stmt, struct obuf *out,
 		const char *name = sqlite3_column_name(stmt, i);
 		const char *type = sqlite3_column_datatype(stmt, i);
 		/*
-		 * Can not fail, since all column names are
-		 * preallocated during prepare phase and the
+		 * Can not fail, since all column names and types
+		 * are preallocated during prepare phase and the
 		 * column_name simply returns them.
 		 */
 		assert(name != NULL);
+		assert(type != NULL);
 		size += mp_sizeof_str(strlen(name));
 		size += mp_sizeof_str(strlen(type));
 		char *pos = (char *) obuf_alloc(out, size);
diff --git a/src/box/sql/pragma.c b/src/box/sql/pragma.c
index de81c28..03ba2a4 100644
--- a/src/box/sql/pragma.c
+++ b/src/box/sql/pragma.c
@@ -112,25 +112,18 @@ sqlite3GetBoolean(const char *z, u8 dflt)
  * the rest of the file if PRAGMAs are omitted from the build.
  */
 
-/*
- * Set result column names for a pragma.
- */
+/** Set result column names and types for a pragma. */
 static void
-setPragmaResultColumnNames(Vdbe * v,	/* The query under construction */
-			   const PragmaName * pPragma	/* The pragma */
-    )
+vdbe_set_pragma_result_columns(struct Vdbe *v, const struct PragmaName *pragma)
 {
-	u8 n = pPragma->nPragCName;
-	sqlite3VdbeSetNumCols(v, n == 0 ? 1 : n);
-	if (n == 0) {
-		sqlite3VdbeSetColName(v, 0, COLNAME_NAME, pPragma->zName,
+	int n = pragma->nPragCName;
+	assert(n > 0);
+	sqlite3VdbeSetNumCols(v, n);
+	for (int i = 0, j = pragma->iPragCName; i < n; ++i) {
+		sqlite3VdbeSetColName(v, i, COLNAME_NAME, pragCName[j++],
+				      SQLITE_STATIC);
+		sqlite3VdbeSetColName(v, i, COLNAME_DECLTYPE, pragCName[j++],
 				      SQLITE_STATIC);
-	} else {
-		int i, j;
-		for (i = 0, j = pPragma->iPragCName; i < n; i++, j++) {
-			sqlite3VdbeSetColName(v, i, COLNAME_NAME, pragCName[j],
-					      SQLITE_STATIC);
-		}
 	}
 }
 
@@ -437,17 +430,15 @@ sqlite3Pragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
 		goto pragma_out;
 	}
 	/* Register the result column names for pragmas that return results */
-	if ((pPragma->mPragFlg & PragFlg_NoColumns) == 0
-	    && ((pPragma->mPragFlg & PragFlg_NoColumns1) == 0 || zRight == 0)
-	    ) {
-		setPragmaResultColumnNames(v, pPragma);
-	}
+	if ((pPragma->mPragFlg & PragFlg_NoColumns) == 0 &&
+	    ((pPragma->mPragFlg & PragFlg_NoColumns1) == 0 || zRight == NULL))
+		vdbe_set_pragma_result_columns(v, pPragma);
 	/* Jump to the appropriate pragma handler */
 	switch (pPragma->ePragTyp) {
 
 	case PragTyp_FLAG:{
 		if (zRight == NULL) {
-			setPragmaResultColumnNames(v, pPragma);
+			vdbe_set_pragma_result_columns(v, pPragma);
 			returnSingleInt(v, (user_session->sql_flags &
 					    pPragma->iArg) != 0);
 		} else {
diff --git a/src/box/sql/pragma.h b/src/box/sql/pragma.h
index 6ccf720..b7b2110 100644
--- a/src/box/sql/pragma.h
+++ b/src/box/sql/pragma.h
@@ -25,50 +25,142 @@
 #define PragFlg_SchemaOpt  0x40	/* Schema restricts name search if present */
 #define PragFlg_SchemaReq  0x80	/* Schema required - "main" is default */
 
-/* Names of columns for pragmas that return multi-column result
- * or that return single-column results where the name of the
- * result column is different from the name of the pragma
+/**
+ * Column names and types for pragmas. The type of the column is
+ * the following value after its name.
  */
 static const char *const pragCName[] = {
 	/* Used by: table_info */
 	/*   0 */ "cid",
-	/*   1 */ "name",
-	/*   2 */ "type",
-	/*   3 */ "notnull",
-	/*   4 */ "dflt_value",
-	/*   5 */ "pk",
+	/*   1 */ "INTEGER",
+	/*   2 */ "name",
+	/*   3 */ "TEXT",
+	/*   4 */ "type",
+	/*   3 */ "TEXT",
+	/*   6 */ "notnull",
+	/*   1 */ "INTEGER",
+	/*   8 */ "dflt_value",
+	/*   9 */ "TEXT",
+	/*  10 */ "pk",
+	/*  11 */ "INTEGER",
 	/* Used by: stats */
-	/*   6 */ "table",
-	/*   7 */ "index",
-	/*   8 */ "width",
-	/*   9 */ "height",
+	/*  12 */ "table",
+	/*  13 */ "TEXT",
+	/*  14 */ "index",
+	/*  15 */ "TEXT",
+	/*  16 */ "width",
+	/*  17 */ "INTEGER",
+	/*  18 */ "height",
+	/*  19 */ "INTEGER",
 	/* Used by: index_info */
-	/*  10 */ "seqno",
-	/*  11 */ "cid",
-	/*  12 */ "name",
-	/*  13 */ "desc",
-	/*  14 */ "coll",
-	/*  15 */ "type",
+	/*  20 */ "seqno",
+	/*  21 */ "INTEGER",
+	/*  22 */ "cid",
+	/*  23 */ "INTEGER",
+	/*  24 */ "name",
+	/*  25 */ "TEXT",
+	/*  26 */ "desc",
+	/*  27 */ "INTEGER",
+	/*  28 */ "coll",
+	/*  29 */ "TEXT",
+	/*  30 */ "type",
+	/*  31 */ "TEXT",
 	/* Used by: index_list */
-	/*  16 */ "seq",
-	/*  17 */ "name",
-	/*  18 */ "unique",
-	/*  19 */ "origin",
-	/*  20 */ "partial",
+	/*  32 */ "seq",
+	/*  33 */ "INTEGER",
+	/*  34 */ "name",
+	/*  35 */ "TEXT",
+	/*  36 */ "unique",
+	/*  37 */ "INTEGER",
+	/*  38 */ "origin",
+	/*  39 */ "TEXT",
+	/*  40 */ "partial",
+	/*  41 */ "INTEGER",
 	/* Used by: collation_list */
-	/*  21 */ "seq",
-	/*  22 */ "name",
+	/*  42 */ "seq",
+	/*  43 */ "INTEGER",
+	/*  44 */ "name",
+	/*  45 */ "TEXT",
 	/* Used by: foreign_key_list */
-	/*  23 */ "id",
-	/*  24 */ "seq",
-	/*  25 */ "table",
-	/*  26 */ "from",
-	/*  27 */ "to",
-	/*  28 */ "on_update",
-	/*  29 */ "on_delete",
-	/*  30 */ "match",
+	/*  46 */ "id",
+	/*  47 */ "INTEGER",
+	/*  48 */ "seq",
+	/*  49 */ "INTEGER",
+	/*  50 */ "table",
+	/*  51 */ "TEXT",
+	/*  52 */ "from",
+	/*  53 */ "TEXT",
+	/*  54 */ "to",
+	/*  55 */ "TEXT",
+	/*  56 */ "on_update",
+	/*  57 */ "TEXT",
+	/*  58 */ "on_delete",
+	/*  59 */ "TEXT",
+	/*  60 */ "match",
+	/*  61 */ "TEXT",
 	/* Used by: busy_timeout */
-	/*  31 */ "timeout",
+	/*  62 */ "timeout",
+	/*  63 */ "INTEGER",
+	/* Used by: case_sensitive_like */
+	/*  64 */ "case_sensitive_like",
+	/*  65 */ "INTEGER",
+	/* Used by: count_changes */
+	/*  66 */ "count_changes",
+	/*  67 */ "INTEGER",
+	/* Used by: defer_foreign_keys */
+	/*  68 */ "defer_foreign_keys",
+	/*  69 */ "INTEGER",
+	/* Used by: full_column_names */
+	/*  70 */ "full_column_names",
+	/*  71 */ "INTEGER",
+	/* Used by: parser_trace */
+	/*  72 */ "parser_trace",
+	/*  73 */ "INTEGER",
+	/* Used by: query_only */
+	/*  74 */ "query_only",
+	/*  75 */ "INTEGER",
+	/* Used by: read_uncommitted */
+	/*  76 */ "read_uncommitted",
+	/*  77 */ "INTEGER",
+	/* Used by: recursive_triggers */
+	/*  78 */ "recursive_triggers",
+	/*  79 */ "INTEGER",
+	/* Used by: reverse_unordered_selects */
+	/*  80 */ "reverse_unordered_selects",
+	/*  81 */ "INTEGER",
+	/* Used by: select_trace */
+	/*  82 */ "select_trace",
+	/*  83 */ "INTEGER",
+	/* Used by: short_column_names */
+	/*  84 */ "short_column_names",
+	/*  85 */ "INTEGER",
+	/* Used by: sql_compound_select_limit */
+	/*  86 */ "sql_compound_select_limit",
+	/*  87 */ "INTEGER",
+	/* Used by: sql_default_engine */
+	/*  88 */ "sql_default_engine",
+	/*  89 */ "TEXT",
+	/* Used by: sql_trace */
+	/*  90 */ "sql_trace",
+	/*  91 */ "INTEGER",
+	/* Used by: vdbe_addoptrace */
+	/*  92 */ "vdbe_addoptrace",
+	/*  93 */ "INTEGER",
+	/* Used by: vdbe_debug */
+	/*  94 */ "vdbe_debug",
+	/*  95 */ "INTEGER",
+	/* Used by: vdbe_eqp */
+	/*  96 */ "vdbe_eqp",
+	/*  97 */ "INTEGER",
+	/* Used by: vdbe_listing */
+	/*  98 */ "vdbe_listing",
+	/*  99 */ "INTEGER",
+	/* Used by: vdbe_trace */
+	/*  100 */ "vdbe_trace",
+	/*  101 */ "INTEGER",
+	/* Used by: where_trace */
+	/*  102 */ "where_trace",
+	/*  103 */ "INTEGER",
 };
 
 /* Definitions of all built-in pragmas */
@@ -77,7 +169,7 @@ typedef struct PragmaName {
 	u8 ePragTyp;		/* PragTyp_XXX value */
 	u8 mPragFlg;		/* Zero or more PragFlg_XXX values */
 	u8 iPragCName;		/* Start of column names in pragCName[] */
-	u8 nPragCName;		/* Num of col names. 0 means use pragma name */
+	u8 nPragCName;		/* Num of col names. */
 	u32 iArg;		/* Extra argument */
 } PragmaName;
 /**
@@ -88,112 +180,112 @@ static const PragmaName aPragmaName[] = {
 	{ /* zName:     */ "busy_timeout",
 	 /* ePragTyp:  */ PragTyp_BUSY_TIMEOUT,
 	 /* ePragFlg:  */ PragFlg_Result0,
-	 /* ColNames:  */ 31, 1,
+	 /* ColNames:  */ 62, 1,
 	 /* iArg:      */ 0},
 	{ /* zName:     */ "case_sensitive_like",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 64, 1,
 	 /* iArg:      */ LIKE_CASE_SENS_FLAG},
 	{ /* zName:     */ "collation_list",
 	 /* ePragTyp:  */ PragTyp_COLLATION_LIST,
 	 /* ePragFlg:  */ PragFlg_Result0,
-	 /* ColNames:  */ 21, 2,
+	 /* ColNames:  */ 42, 2,
 	 /* iArg:      */ 0},
 	{ /* zName:     */ "count_changes",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 66, 1,
 	 /* iArg:      */ SQLITE_CountRows},
 	{ /* zName:     */ "defer_foreign_keys",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 68, 1,
 	 /* iArg:      */ SQLITE_DeferFKs},
 	{ /* zName:     */ "foreign_key_list",
 	 /* ePragTyp:  */ PragTyp_FOREIGN_KEY_LIST,
 	 /* ePragFlg:  */
 	 PragFlg_NeedSchema | PragFlg_Result1 | PragFlg_SchemaOpt,
-	 /* ColNames:  */ 23, 8,
+	 /* ColNames:  */ 46, 8,
 	 /* iArg:      */ 0},
 	{ /* zName:     */ "full_column_names",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 70, 1,
 	 /* iArg:      */ SQLITE_FullColNames},
 	{ /* zName:     */ "index_info",
 	 /* ePragTyp:  */ PragTyp_INDEX_INFO,
 	 /* ePragFlg:  */
 	 PragFlg_NeedSchema | PragFlg_Result1 | PragFlg_SchemaOpt,
-	 /* ColNames:  */ 10, 6,
+	 /* ColNames:  */ 20, 6,
 	 /* iArg:      */ 1},
 	{ /* zName:     */ "index_list",
 	 /* ePragTyp:  */ PragTyp_INDEX_LIST,
 	 /* ePragFlg:  */
 	 PragFlg_NeedSchema | PragFlg_Result1 | PragFlg_SchemaOpt,
-	 /* ColNames:  */ 16, 5,
+	 /* ColNames:  */ 32, 5,
 	 /* iArg:      */ 0},
 #if defined(SQLITE_DEBUG)
 	{ /* zName:     */ "parser_trace",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 72, 1,
 	 /* iArg:      */ PARSER_TRACE_FLAG},
 #endif
 	{ /* zName:     */ "query_only",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 74, 1,
 	 /* iArg:      */ SQLITE_QueryOnly},
 	{ /* zName:     */ "read_uncommitted",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 76, 1,
 	 /* iArg:      */ SQLITE_ReadUncommitted},
 	{ /* zName:     */ "recursive_triggers",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 78, 1,
 	 /* iArg:      */ SQLITE_RecTriggers},
 	{ /* zName:     */ "reverse_unordered_selects",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 80, 1,
 	 /* iArg:      */ SQLITE_ReverseOrder},
 #if defined(SQLITE_DEBUG)
 	{ /* zName:     */ "select_trace",
 	/* ePragTyp:  */ PragTyp_FLAG,
 	/* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	/* ColNames:  */ 0, 0,
+	/* ColNames:  */ 82, 1,
 	/* iArg:      */ SQLITE_SelectTrace},
 #endif
 	{ /* zName:     */ "short_column_names",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 84, 1,
 	 /* iArg:      */ SQLITE_ShortColNames},
 	{ /* zName:     */ "sql_compound_select_limit",
 	/* ePragTyp:  */ PragTyp_COMPOUND_SELECT_LIMIT,
 	/* ePragFlg:  */ PragFlg_Result0,
-	/* ColNames:  */ 0, 0,
+	/* ColNames:  */ 86, 1,
 	/* iArg:      */ 0},
 	{ /* zName:     */ "sql_default_engine",
 	 /* ePragTyp:  */ PragTyp_DEFAULT_ENGINE,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 88, 1,
 	 /* iArg:      */ 0},
 #if defined(SQLITE_DEBUG)
 	{ /* zName:     */ "sql_trace",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 90, 1,
 	 /* iArg:      */ SQLITE_SqlTrace},
 #endif
 	{ /* zName:     */ "stats",
 	 /* ePragTyp:  */ PragTyp_STATS,
 	 /* ePragFlg:  */
 	 PragFlg_NeedSchema | PragFlg_Result0 | PragFlg_SchemaReq,
-	 /* ColNames:  */ 6, 4,
+	 /* ColNames:  */ 12, 4,
 	 /* iArg:      */ 0},
 	{ /* zName:     */ "table_info",
 	 /* ePragTyp:  */ PragTyp_TABLE_INFO,
@@ -205,33 +297,33 @@ static const PragmaName aPragmaName[] = {
 	{ /* zName:     */ "vdbe_addoptrace",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 92, 1,
 	 /* iArg:      */ SQLITE_VdbeAddopTrace},
 	{ /* zName:     */ "vdbe_debug",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 94, 1,
 	 /* iArg:      */
 	 SQLITE_SqlTrace | SQLITE_VdbeListing | SQLITE_VdbeTrace},
 	{ /* zName:     */ "vdbe_eqp",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 96, 1,
 	 /* iArg:      */ SQLITE_VdbeEQP},
 	{ /* zName:     */ "vdbe_listing",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 98, 1,
 	 /* iArg:      */ SQLITE_VdbeListing},
 	{ /* zName:     */ "vdbe_trace",
 	 /* ePragTyp:  */ PragTyp_FLAG,
 	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	 /* ColNames:  */ 0, 0,
+	 /* ColNames:  */ 100, 1,
 	 /* iArg:      */ SQLITE_VdbeTrace},
 	{ /* zName:     */ "where_trace",
 	/* ePragTyp:  */ PragTyp_FLAG,
 	/* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
-	/* ColNames:  */ 0, 0,
+	/* ColNames:  */ 102, 1,
 	/* iArg:      */ SQLITE_WhereTrace},
 #endif
 };
diff --git a/src/box/sql/prepare.c b/src/box/sql/prepare.c
index 824578e..87326da 100644
--- a/src/box/sql/prepare.c
+++ b/src/box/sql/prepare.c
@@ -54,7 +54,6 @@ sqlite3Prepare(sqlite3 * db,	/* Database handle. */
 {
 	char *zErrMsg = 0;	/* Error message */
 	int rc = SQLITE_OK;	/* Result code */
-	int i;			/* Loop counter */
 	Parse sParse;		/* Parsing context */
 	sql_parser_create(&sParse, db);
 	sParse.pReprepare = pReprepare;
@@ -113,23 +112,48 @@ sqlite3Prepare(sqlite3 * db,	/* Database handle. */
 
 	if (rc == SQLITE_OK && sParse.pVdbe && sParse.explain) {
 		static const char *const azColName[] = {
-			"addr", "opcode", "p1", "p2", "p3", "p4", "p5",
-			    "comment",
-			"selectid", "order", "from", "detail"
+			/*  0 */ "addr",
+			/*  1 */ "INTEGER",
+			/*  2 */ "opcode",
+			/*  3 */ "TEXT",
+			/*  4 */ "p1",
+			/*  5 */ "INTEGER",
+			/*  6 */ "p2",
+			/*  7 */ "INTEGER",
+			/*  8 */ "p3",
+			/*  9 */ "INTEGER",
+			/* 10 */ "p4",
+			/* 11 */ "TEXT",
+			/* 12 */ "p5",
+			/* 13 */ "TEXT",
+			/* 14 */ "comment",
+			/* 15 */ "TEXT",
+			/* 16 */ "selectid",
+			/* 17 */ "INTEGER",
+			/* 18 */ "order",
+			/* 19 */ "INTEGER",
+			/* 20 */ "from",
+			/* 21 */ "INTEGER",
+			/* 22 */ "detail",
+			/* 23 */ "TEXT",
 		};
-		int iFirst, mx;
+
+		int name_first, name_count;
 		if (sParse.explain == 2) {
-			sqlite3VdbeSetNumCols(sParse.pVdbe, 4);
-			iFirst = 8;
-			mx = 12;
+			name_first = 16;
+			name_count = 4;
 		} else {
-			sqlite3VdbeSetNumCols(sParse.pVdbe, 8);
-			iFirst = 0;
-			mx = 8;
+			name_first = 0;
+			name_count = 8;
 		}
-		for (i = iFirst; i < mx; i++) {
-			sqlite3VdbeSetColName(sParse.pVdbe, i - iFirst,
-					      COLNAME_NAME, azColName[i],
+		sqlite3VdbeSetNumCols(sParse.pVdbe, name_count);
+		for (int i = 0; i < name_count; i++) {
+			int name_index = 2 * i + name_first;
+			sqlite3VdbeSetColName(sParse.pVdbe, i, COLNAME_NAME,
+					      azColName[name_index],
+					      SQLITE_STATIC);
+			sqlite3VdbeSetColName(sParse.pVdbe, i, COLNAME_DECLTYPE,
+					      azColName[name_index + 1],
 					      SQLITE_STATIC);
 		}
 	}
diff --git a/test/sql/iproto.result b/test/sql/iproto.result
index 9ace282..0a17e4a 100644
--- a/test/sql/iproto.result
+++ b/test/sql/iproto.result
@@ -821,6 +821,75 @@ box.sql.execute('DROP TABLE t1')
 cn:close()
 ---
 ...
+-- gh-3832: Some statements do not return column type
+box.sql.execute('CREATE TABLE t1(id INTEGER PRIMARY KEY)')
+---
+...
+cn = remote.connect(box.cfg.listen)
+---
+...
+-- PRAGMA:
+res = cn:execute("PRAGMA table_info(t1)")
+---
+...
+res.metadata
+---
+- - name: cid
+    type: INTEGER
+  - name: name
+    type: TEXT
+  - name: type
+    type: TEXT
+  - name: notnull
+    type: INTEGER
+  - name: dflt_value
+    type: TEXT
+  - name: pk
+    type: INTEGER
+...
+-- EXPLAIN
+res = cn:execute("EXPLAIN SELECT 1")
+---
+...
+res.metadata
+---
+- - name: addr
+    type: INTEGER
+  - name: opcode
+    type: TEXT
+  - name: p1
+    type: INTEGER
+  - name: p2
+    type: INTEGER
+  - name: p3
+    type: INTEGER
+  - name: p4
+    type: TEXT
+  - name: p5
+    type: TEXT
+  - name: comment
+    type: TEXT
+...
+res = cn:execute("EXPLAIN QUERY PLAN SELECT COUNT(*) FROM t1")
+---
+...
+res.metadata
+---
+- - name: selectid
+    type: INTEGER
+  - name: order
+    type: INTEGER
+  - name: from
+    type: INTEGER
+  - name: detail
+    type: TEXT
+...
+cn:close()
+---
+...
+box.sql.execute('DROP TABLE t1')
+---
+...
 box.schema.user.revoke('guest', 'read,write,execute', 'universe')
 ---
 ...
diff --git a/test/sql/iproto.test.lua b/test/sql/iproto.test.lua
index 6640903..6fa5d95 100644
--- a/test/sql/iproto.test.lua
+++ b/test/sql/iproto.test.lua
@@ -263,10 +263,26 @@ box.sql.execute('DROP TABLE t1')
 
 cn:close()
 
+-- gh-3832: Some statements do not return column type
+box.sql.execute('CREATE TABLE t1(id INTEGER PRIMARY KEY)')
+cn = remote.connect(box.cfg.listen)
+
+-- PRAGMA:
+res = cn:execute("PRAGMA table_info(t1)")
+res.metadata
+
+-- EXPLAIN
+res = cn:execute("EXPLAIN SELECT 1")
+res.metadata
+res = cn:execute("EXPLAIN QUERY PLAN SELECT COUNT(*) FROM t1")
+res.metadata
+
+cn:close()
+box.sql.execute('DROP TABLE t1')
+
 box.schema.user.revoke('guest', 'read,write,execute', 'universe')
 box.schema.user.revoke('guest', 'create', 'space')
 space = nil
 
 -- Cleanup xlog
 box.snapshot()
-
-- 
2.7.4





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