[Tarantool-patches] [PATCH v1 1/1] sql: remove OP_Realify

[imeevma@tarantool.org]

This opcode was used to convert INTEGER values to REAL. It is not
necessary in Tarantool and may cause errors.

Closes #5335
---
https://github.com/tarantool/tarantool/issues/5335
https://github.com/tarantool/tarantool/tree/imeevma/gh-5335-remove-op-realify

@ChangeLog
 - Fixed a bug with unnecessary convertion from INTEGER to DOUBLE (gh-5335).

 src/box/sql/delete.c                          | 12 -----
 src/box/sql/expr.c                            | 13 -----
 src/box/sql/vdbe.c                            | 17 -------
 ...-unnecessary-conversation-to-double.result | 51 +++++++++++++++++++
 ...nnecessary-conversation-to-double.test.lua | 11 ++++
 5 files changed, 62 insertions(+), 42 deletions(-)
 create mode 100644 test/sql/gh-5335-unnecessary-conversation-to-double.result
 create mode 100644 test/sql/gh-5335-unnecessary-conversation-to-double.test.lua

diff --git a/src/box/sql/delete.c b/src/box/sql/delete.c
index 68abd1f58..a78c68df6 100644
--- a/src/box/sql/delete.c
+++ b/src/box/sql/delete.c
@@ -565,18 +565,6 @@ sql_generate_index_key(struct Parse *parse, struct index *index, int cursor,
 		}
 		uint32_t tabl_col = index->def->key_def->parts[j].fieldno;
 		sqlVdbeAddOp3(v, OP_Column, cursor, tabl_col, reg_base + j);
-		/*
-		 * If the column type is NUMBER but the number
-		 * is an integer, then it might be stored in the
-		 * table as an integer (using a compact
-		 * representation) then converted to REAL by an
-		 * OP_Realify opcode. But we are getting
-		 * ready to store this value back into an index,
-		 * where it should be converted by to INTEGER
-		 * again.  So omit the OP_Realify opcode if
-		 * it is present
-		 */
-		sqlVdbeDeletePriorOpcode(v, OP_Realify);
 	}
 	if (reg_out != 0)
 		sqlVdbeAddOp3(v, OP_MakeRecord, reg_base, col_cnt, reg_out);
diff --git a/src/box/sql/expr.c b/src/box/sql/expr.c
index bc2182446..09a2d3ef9 100644
--- a/src/box/sql/expr.c
+++ b/src/box/sql/expr.c
@@ -3700,11 +3700,6 @@ sqlExprCodeTarget(Parse * pParse, Expr * pExpr, int target)
 				sqlVdbeAddOp3(v, OP_Column,
 						  pAggInfo->sortingIdxPTab,
 						  pCol->iSorterColumn, target);
-				if (pCol->space_def->fields[pExpr->iAgg].type ==
-				    FIELD_TYPE_NUMBER) {
-					sqlVdbeAddOp1(v, OP_Realify,
-							  target);
-				}
 				return target;
 			}
 			/* Otherwise, fall thru into the TK_COLUMN case */
@@ -4257,14 +4252,6 @@ sqlExprCodeTarget(Parse * pParse, Expr * pExpr, int target)
 				    (pExpr->iTable ? "new" : "old"),
 				    pExpr->space_def->fields[
 					pExpr->iColumn].name, target));
-
-			/* If the column has type NUMBER, it may currently be stored as an
-			 * integer. Use OP_Realify to make sure it is really real.
-			 */
-			if (pExpr->iColumn >= 0 && def->fields[
-				pExpr->iColumn].type == FIELD_TYPE_NUMBER) {
-				sqlVdbeAddOp1(v, OP_Realify, target);
-			}
 			break;
 		}
 
diff --git a/src/box/sql/vdbe.c b/src/box/sql/vdbe.c
index 14ddb5160..a86461c4c 100644
--- a/src/box/sql/vdbe.c
+++ b/src/box/sql/vdbe.c
@@ -2105,23 +2105,6 @@ case OP_MustBeInt: {            /* jump, in1 */
 	break;
 }
 
-/* Opcode: Realify P1 * * * *
- *
- * If register P1 holds an integer convert it to a real value.
- *
- * This opcode is used when extracting information from a column that
- * has float type.  Such column values may still be stored as
- * integers, for space efficiency, but after extraction we want them
- * to have only a real value.
- */
-case OP_Realify: {                  /* in1 */
-	pIn1 = &aMem[pOp->p1];
-	if ((pIn1->flags & (MEM_Int | MEM_UInt)) != 0) {
-		sqlVdbeMemRealify(pIn1);
-	}
-	break;
-}
-
 /* Opcode: Cast P1 P2 * * *
  * Synopsis: type(r[P1])
  *
diff --git a/test/sql/gh-5335-unnecessary-conversation-to-double.result b/test/sql/gh-5335-unnecessary-conversation-to-double.result
new file mode 100644
index 000000000..e3f0f0b0b
--- /dev/null
+++ b/test/sql/gh-5335-unnecessary-conversation-to-double.result
@@ -0,0 +1,51 @@
+-- test-run result file version 2
+-- Make sure that INTEGER is not converted to DOUBLE in cases below.
+box.execute("CREATE TABLE t (i NUMBER PRIMARY KEY, n NUMBER);")
+ | ---
+ | - row_count: 1
+ | ...
+box.execute("CREATE TRIGGER t AFTER INSERT ON t FOR EACH ROW BEGIN UPDATE t SET n = new.n; END;")
+ | ---
+ | - row_count: 1
+ | ...
+box.execute("INSERT INTO t VALUES (1, 1);")
+ | ---
+ | - row_count: 1
+ | ...
+box.execute("SELECT i / 2, n / 2 FROM t;")
+ | ---
+ | - metadata:
+ |   - name: COLUMN_1
+ |     type: number
+ |   - name: COLUMN_2
+ |     type: number
+ |   rows:
+ |   - [0, 0]
+ | ...
+box.execute("DROP TABLE t;")
+ | ---
+ | - row_count: 1
+ | ...
+
+box.execute("CREATE TABLE t (i NUMBER PRIMARY KEY, n NUMBER);")
+ | ---
+ | - row_count: 1
+ | ...
+box.execute("INSERT INTO t VALUES (1,1);")
+ | ---
+ | - row_count: 1
+ | ...
+box.execute("SELECT i / 2, n / 2 FROM t GROUP BY n;")
+ | ---
+ | - metadata:
+ |   - name: COLUMN_1
+ |     type: number
+ |   - name: COLUMN_2
+ |     type: number
+ |   rows:
+ |   - [0, 0]
+ | ...
+box.execute("DROP TABLE t;")
+ | ---
+ | - row_count: 1
+ | ...
diff --git a/test/sql/gh-5335-unnecessary-conversation-to-double.test.lua b/test/sql/gh-5335-unnecessary-conversation-to-double.test.lua
new file mode 100644
index 000000000..1663d054a
--- /dev/null
+++ b/test/sql/gh-5335-unnecessary-conversation-to-double.test.lua
@@ -0,0 +1,11 @@
+-- Make sure that INTEGER is not converted to DOUBLE in cases below.
+box.execute("CREATE TABLE t (i NUMBER PRIMARY KEY, n NUMBER);")
+box.execute("CREATE TRIGGER t AFTER INSERT ON t FOR EACH ROW BEGIN UPDATE t SET n = new.n; END;")
+box.execute("INSERT INTO t VALUES (1, 1);")
+box.execute("SELECT i / 2, n / 2 FROM t;")
+box.execute("DROP TABLE t;")
+
+box.execute("CREATE TABLE t (i NUMBER PRIMARY KEY, n NUMBER);")
+box.execute("INSERT INTO t VALUES (1,1);")
+box.execute("SELECT i / 2, n / 2 FROM t GROUP BY n;")
+box.execute("DROP TABLE t;")
-- 
2.25.1