[tarantool-patches] [PATCH v2 1/3] sql: do not add explicit <COLLATE "BINARY"> clause

[Nikita Pettik <korablev@tarantool.org>]

We don't need to add explicit COLLATE "BINARY" clause since binary
collation is anyway default. On the other hand, it may confuse
due to ambiugty when comparing two terms.

Needed for #3185
---
 src/box/sql/fkey.c      |  2 --
 src/box/sql/select.c    |  4 ----
 src/box/sql/whereexpr.c | 25 ++++++++++++-------------
 3 files changed, 12 insertions(+), 19 deletions(-)

diff --git a/src/box/sql/fkey.c b/src/box/sql/fkey.c
index fc39c879e..4e3270f0c 100644
--- a/src/box/sql/fkey.c
+++ b/src/box/sql/fkey.c
@@ -313,8 +313,6 @@ exprTableRegister(Parse * pParse,	/* Parsing and code generating context */
 			pExpr->iTable = regBase + iCol + 1;
 			char affinity = pTab->def->fields[iCol].affinity;
 			pExpr->affinity = affinity;
-			pExpr = sqlite3ExprAddCollateString(pParse, pExpr,
-							    "binary");
 		} else {
 			pExpr->iTable = regBase;
 			pExpr->affinity = AFFINITY_INTEGER;
diff --git a/src/box/sql/select.c b/src/box/sql/select.c
index 16b1044d6..dfa6ed8e0 100644
--- a/src/box/sql/select.c
+++ b/src/box/sql/select.c
@@ -2238,10 +2238,6 @@ sql_multiselect_orderby_to_key_info(struct Parse *parse, struct Select *s,
 				order_by->a[i].pExpr =
 					sqlite3ExprAddCollateString(parse, term,
 								    name);
-			} else {
-				order_by->a[i].pExpr =
-					sqlite3ExprAddCollateString(parse, term,
-								    "BINARY");
 			}
 		}
 		part->coll_id = id;
diff --git a/src/box/sql/whereexpr.c b/src/box/sql/whereexpr.c
index 612868695..9fa6ce15d 100644
--- a/src/box/sql/whereexpr.c
+++ b/src/box/sql/whereexpr.c
@@ -1133,7 +1133,6 @@ exprAnalyze(SrcList * pSrc,	/* the FROM clause */
 		Expr *pNewExpr2;
 		int idxNew1;
 		int idxNew2;
-		const char *zCollSeqName;	/* Name of collating sequence */
 		const u16 wtFlags = TERM_LIKEOPT | TERM_VIRTUAL | TERM_DYNAMIC;
 
 		pLeft = pExpr->x.pList->a[1].pExpr;
@@ -1171,24 +1170,24 @@ exprAnalyze(SrcList * pSrc,	/* the FROM clause */
 			}
 			*pC = c + 1;
 		}
-		/* Support only for unicode_ci indexes by now */
-		zCollSeqName = noCase ? "unicode_ci" : "BINARY";
 		pNewExpr1 = sqlite3ExprDup(db, pLeft, 0);
-		pNewExpr1 = sqlite3PExpr(pParse, TK_GE,
-					 sqlite3ExprAddCollateString(pParse,
-								     pNewExpr1,
-								     zCollSeqName),
-					 pStr1);
+		if (noCase) {
+			pNewExpr1 =
+				sqlite3ExprAddCollateString(pParse, pNewExpr1,
+							    "unicode_ci");
+		}
+		pNewExpr1 = sqlite3PExpr(pParse, TK_GE, pNewExpr1, pStr1);
 		transferJoinMarkings(pNewExpr1, pExpr);
 		idxNew1 = whereClauseInsert(pWC, pNewExpr1, wtFlags);
 		testcase(idxNew1 == 0);
 		exprAnalyze(pSrc, pWC, idxNew1);
 		pNewExpr2 = sqlite3ExprDup(db, pLeft, 0);
-		pNewExpr2 = sqlite3PExpr(pParse, TK_LT,
-					 sqlite3ExprAddCollateString(pParse,
-								     pNewExpr2,
-								     zCollSeqName),
-					 pStr2);
+		if (noCase) {
+			pNewExpr2 =
+				sqlite3ExprAddCollateString(pParse, pNewExpr2,
+							    "unicode_ci");
+		}
+		pNewExpr2 = sqlite3PExpr(pParse, TK_LT, pNewExpr2, pStr2);
 		transferJoinMarkings(pNewExpr2, pExpr);
 		idxNew2 = whereClauseInsert(pWC, pNewExpr2, wtFlags);
 		testcase(idxNew2 == 0);
-- 
2.15.1